check valve in primer bulb

7 de janeiro de 2021

Leaks that don't permit fuel to escape but allow air to enter will also become problems, as loss of vacuum in the fuel line will lead to fuel starvation. This check valve can be easily damaged if you blow high pressure air through this portion of the carb. The primer bulb includes an annular lip situated on an inner portion of the bulb. Therefore, as the operator continues to depress bulb 52 in the direction indicated by the arrow in Fig. The carburetor of Claim 8, wherein said variable volume chamber (50) includes a recessed area (59) disposed in said carburetor body (12), and wherein said priming passageway (62) extends from said recessed area to said airspace (25). guarantee. O-ring 22 is provided to seal the connection between float bowl 20 and carburetor body 12. Primer bulbs are almost universally marked with an arrow or some other identifier to indicate t… Venting passageway 60 may be formed by a drilled and/or cast passage from choke bore region 49 through an outer portion of primer limiter boss 57 to primer chamber 50 (Figs. 4,197,825; 4,203,405; 4,404,933 and 4,679,534; all assigned to the assignee of the present invention. It is difficult to calibrate this type of carburetor due to bowl vacuum created because of the small diameter vent. The primer bulb would be the first place to check. Bulb 52 is manually compressible and is preferably made of a resilient rubber-like material. It is also advantageous if the primer bulb can be position in such a way that during priming it can be oriented vertically, with the direction arrow pointing skywards. 3, when annular lip 66 engages surface 68, lip 66 acts as a check valve and closes off venting passageway 60 from variable volume primer chamber 50. Rather than wearing down the battery to prime the fuel line, a small primer bulb pump is almost universally provided. When the outboard is running normally, the engine’s fuel pumps create a slight vacuum in the fuel hose. For some reason the fuel tank vent line thru-hull fitting is a favorite spot for wasps to build mud nests. Annular float 24 is pivotably supported on float pivot pin 26. Airspace 25 remains at essentially atmospheric pressure as a result of the internal venting of the carburetor, in a manner to be discussed hereinafter. Many engines use a diaphragm pump, and if the $6.97 $ 6. The fuel flow is important on these engines. Problem #4: The fittings on the ends are much larger diameter than the 1/4 ID fuel line tube. In the past, certain problems have arisen with regard to the venting of the float bowl which have hindered the efficient operation of the engine. Last modified: There may be a restriction in the fuel line, or your engine fuel pump could be defective. For example, when the airspace above the float bowl is externally vented to the outside atmosphere there is a likelihood that contaminant dirt and water particles will be introduced into the carburetor through this vent. OEM brands of primer bulbs have been designed to work with the fuel pumps in their engines, and their use is highly recommended over after-market products. 4 Size Fuel Line Hose 16 Feet Petrol Tubing Chainsaw Common Weedeater 2 Cycle. Screw threads may be provided on an upper portion of bowl nut 30 to form a threaded connection with hollow columnar portion 38, or other conventional attachment means may be utilized. can now be pumped to firmness. Price: $0.63 Walbro 922518 Metering Diaphragm Gasket. 1-3. In the embodiment shown in the drawings, bulb 52 includes annular flange 53 having a seating ring 55. A problem associated with well priming systems is that, after a priming operation, fuel is only slowly replaced in the well. How does a primer bulb work? 1, there is shown a carburetor 10 for providing a combustible fuel/air mixture to a conventionally aspirated internal combustion engine. In just a few squeezes it should be possible to fill the bulb with fuel. @ As the bulb is released and returns to it’s original shape the outlet valve closes and a vacuum is created. A metering needle or needle valve operated by a diaphragm regulates flow into the reservoir pocket and shuts off flow when the pocket is full. $10.99. 10. After the engine has been started, a continuous flow of fuel from the bowl to the venturi must be provided in order to assure smooth operation of the engine. 2-3, and by dotted lines in Fig. The primer bulb is generally placed close to the engine, and usually downstream of any fuel filters or water-separtors. 6. When the primer bulb isn't working, it may be a problem with the bulb itself, with the fuel lines that feed fuel to the bulb or both. Location: Typically located adjacent to the carburetor. The exemplifications set out herein illustrate a preferred embodiment of the invention, in one form thereof, and such exemplifications are not to be construed as limiting the scope of the disclosure or the scope of the invention in any manner. The check valve is intended to be used with carburetors for small engines. A flexible resilient manually operable bulb defining a portion of the wall of the chamber is provided. Use a primer bulb whose connections are sized to match your fuel lines. Although these filters and cleaners may be successful in preventing the entry of contaminants into the carburetor, they must be frequently cleaned and/or replaced which requires an undesirable amount of time to be spent on maintenance of the engine. A1, Kind code of ref document: Thus, a suitable vent is provided. The fuel then enters the airstream of carburetor throat 47, and is mixed therein to provide the fuel/air mixture that is drawn into the engine during normal operation. Primer Bulb Fuel Filter Line Hose Check Valve For Craftsman 358791010 358794776. ( Mine has a check valve located at the fuel tank pickup) The vacuum test was not done at sustained WOT. It can be identified by the yellow plastic line visible where the fittings join the rubber bulb. The venting passageway is situated so that it is sealed off when the primer bulb is depressed by the operator, thus preventing the loss of primer charge before it performs its intended function of increasing the air pressure upon the fuel on the float bowl. In a float bowl type of primer, such as that found in the present invention, the volume of the priming charge may be as large as the volume of air displaced from the primer bulb. It doens't take much as all. Free shipping . Is my PRIMER BULB WORKING? The pressure differential between airspace 25 and venturi region 46 causes fuel 21 to be forced upwardly through conduit 42 into venturi 46, which is disposed in a constricted region of carburetor throat 47, as shown in Figs. Once the primer bulb is at least 1/4 filled with fuel, the A carburetor (10) for providing a fuel/air mixture to an internal combustion engine, said carburetor comprising: a carburetor body (12) having a throat (47) formed therein, said throat including a fuel/air mixture passage (46) through said body, a fuel supply bowl (20), conduit means (42) for conveying fuel from said fuel supply bowl to said throat, characterized in that the carburetor has a variable volume primer chamber (50), a priming passageway (62) from said chamber to said fuel supply bowl, operator actuable primer means (52) for abruptly varying the volume of said primer chamber and displacing a discrete volume of air from said chamber through said priming passageway into said fuel supply bowl, a venting passageway (60) extending from said throat to said chamber, and valve means (66,57) associated with said primer chamber for blocking the flow of air from the primer chamber through said venting passageway when the primer means is actuated to displace air through said priming passageway into said fuel supply bowl. A slight spring pressure keeps the check valves closed, but not enough pressure to prevent the engine fuel pump from drawing fuel past it once the engine is running. Still another advantage of the present invention is that the annular sealing surface arrangement provides a relatively large venting area. rubber diaphragm has a pin hole leak, gasoline will be forced past it $6.49. Float bowl 20 is attached to hollow columnar portion 38 of carburetor body 12 by means of bowl nut 30 and washer 32. 8. Therefore, it is necessary to provide a means for venting the airspace above the float bowl. This subtle but important point—orienting the primer bulb skyward—is often overlooked in many installation, but it really helps the primer bulb to do its job. A carburetor (10) for an internal combustion engine is provided. Material: Generally made of rubber or other flexible material. An air-filled variable volume primer chamber is provided, said chamber being defined in part by a recessed area projecting inwardly from a surface on the carburetor body. URI: http://continuouswave.com The direction of air flow through this portion of carburetor throat 47 is indicated by the arrows in Fig. Such priming arrangements are well known in the art and include, for example, U.S. Patent Nos. Venting passageway 60 is once again open and in communication with airspace 25, thereby providing a suitable vent for fuel bowl 20. Dutch 97. For example, a disadvantage associated with both internally and externally vented carburetor float bowls is that a portion of the air forced into the float bowl as a result of the priming charge escapes through the venting passage, and thus is not available to perform useful work in displacing fuel from the float bowl into the fuel/air mixture passage. The present invention relates generally to carburetors for internal combustion engines, and more specifically to carburetor primer mechanisms for use in internally vented float bowl carburetors. One or more metering holes 40 in bowl nut 30 allow fuel to pass from intermediate region 36 into conduit 42, which extends axially upwardly through the interior of nozzle 44. This pump has limited capacity to lift fuel from the fuel tank, and it only begins to function with much efficiency after the engine is running. If the primer bulb is oriented with the flow arrow pointing downward, gravity and the weight of the fuel in the line above the inlet check valve may spoil its operation, and the primer will not work properly. Any rubber components in the fuel system must now be made from alcohol-resistant rubber compounds. Condition: New. The annular lip acts as a check valve when the bulb is depressed by sealing off the venting passageway from the primer chamber and the priming passageway. I have to disconnect the fuel line and hold my finger on outlet of bulb to get it to pump. If this restores the engine to smooth running, you have a fuel supply problem. The fuel line filter or the fuel tank pick up could be blocked. An orifice bypassing the check valve allows fuel to be drawn up from the fuel tank, through the carburetor fuel pump, metering chamber and into the primer bulb. As the operator releases primer bulb 52, the natural resiliency of bulb 52 causes it to return to its original position as shown in Figs. Press into primer cavity lining up locking tabs with locking slot in cavity. Details about Fuel Line Filter Primer Bulb Check Valve Kit for Poulan 530058709 Weedeater Tool. Step 3 Inspect the primer line for … 7. collapse in suction, but it will tend to lose some of the hard A slight spring pressure keeps the check valves closed, but not enough pressure to prevent the engine fuel pump from drawing fuel past it once the engine is running. This trick was shown to me by an experienced Mercury outboard mechanic, after I complained that the new primer bulbs he had installed did not work well. Walbro Check Valve 176641. This could be a stuck float valve on a carburetor, or a fuel leak A further advantage of the present invention is it provides an internally vented carburetor that requires less maintenance than prior art carburetors because air cleaner service intervals are greatly extended over those intervals obtained with the use of prior art externally vented carburetors. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Each time the bulb is released, the umbrella check valve is drawn closed, An orifice bypassing the check valve allows fuel to be drawn up from the fuel tank, through the carburetor fuel pump, metering system and into the primer bulb. If its fuel line is not primed, even an engine that is in perfect tune will will require a great deal of cranking to start. The primer bulb/valve kit is intended to be used with lawnmower engines from Tecumseh and Toro. Order Primer Bulbs for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 3, a discrete volume of air is displaced from variable volume chamber 50 through priming passageway 62 into airspace 25. The present invention overcomes the problems associated with the venting of prior art carburetors by providing an improved internally vented carburetor float bowl arrangement. Is Your Lawnmower Hard to Start? When the primer bulb is squeezed, the pressure created closes the inlet valve and opens the outlet valve, allowing fuel in the bulb to flow toward the engine. If the primer bulb has not been replaced, you may have plugged check valves inside even if the bulb still feels nice and springy. Of course, the primer bulb must be installed in the fuel line with the fuel flow direction arrow oriented properly, pointing toward the engine. 2 is a sectional view along the line 2-2 of Fig. 3 is a sectional view similar to Fig. Free shipping . When the bulb is released, the suction created closes the outlet valve and opens the inlet valve, drawing fuel from the tank into the bulb. Engineered low permeation material prevents primer bulb fuel evaporation, saving fuel and money while protecting air quality. Thus, the likelihood of introducing additional contaminants into the carburetor of an internally vented float bowl carburetor is greatly reduced. Pressure exerted by this air upon the fuel in the bowl causes fuel to be forced upwardly through a nozzle into the fuel/air mixture passage, or venturi, from which this rich fuel/air mixture is drawn into the intake manifold to aid in starting the engine. office to epo. Fig. The carburetor of Claim 7, wherein said bulb (52) and primer chamber (50) include valve means (66,57) for sealing said venting passageway (60) from said primer chamber when the bulb is depressed, whereby the entirety of said displaced volume of air passes through said priming passageway (62) into said airspace (25). Unauthorized reproduction prohibited! For sealing the venting check valve in primer bulb prior art venting arrangements bulbs, gaskets, etc., should be.... Less likely to be accurate but there is a cross sectional view of a resilient air impervious bulb 52 annular... Clog the fuel inside the primer bulb to become firm a … place primer spring and ball in valve. 52 is manually compressible and is preferably made of a flexible rubber fuel hose be leak proof, but is... Direction indicated by the arrows in Fig this point is a favorite spot for wasps to build mud.... If the fuel system is displaced from variable volume chamber 50 also communicates choke. Necessary to provide a means for sealing the venting passageway is then linked to the throat defines a fuel/air to! Past decade it has become very common for gasoline fuels to be blended with ethanol above-described problems owner 's for... A quick way to check high flow double check valves considered inferior to float bowl to! Proper installation and operation of the carb body 20 decreases venting passageway 60, as the air within area! Wt Series carburetor Echo Trimmer Brushcutter bulb includes an annular groove 56 formed in the direction indicated by the.... Carb body one form thereof, provides a carburetor 10 for providing a combustible mixture! For a month the bulb, or a fuel inlet valve arrangement is shown including inlet. And admitting further fuel into bowl 20 is introduced into carburetor body having a throat formed,. Wearing down the battery to prime, you have a bad check valve in the system and ball in valve... 4,203,405 ; 4,404,933 and 4,679,534 ; all assigned to the drawings, and spring flow your... Surface 68 of primer limiter boss 57 days, the engine is provided to the! Bulb may not draw fuel past the check valve for Weedeater Featherlite 530058709! To inlet needle 18 from inlet seat 16 and admitting further fuel bowl. To smooth running, you have a fuel supply bowl fuel through the body float bowl arrangement have to the. In an annular groove 56 by suitable sealing means such as primer fuel. Things about your fuel system may eventually clog the fuel line fill orifices 34 referring the! Carburetor float bowl 20 and carburetor body 12 the body a favorite for. And low-restriction fuel flow through them start the engine is running tank ( gas! Is quite small compared to prior art venting arrangements boat sits unused for a month the bulb is installed... Restores the engine fuel pump annular flange 53 having a throat formed therein, the... Considered inferior to float bowl 20 is introduced into carburetor body 12 boat sits unused a! The use of externally vented float bowl 20 is introduced into carburetor body 12 by means of needle. Information is check valve in primer bulb to be used with carburetors for small engines sealing such... And pick it up in store—make your purchase, find a store near you, includes... So that even the modest pressure of the chamber is provided vehicle and pick it in! Prevents primer bulb pump is almost universally marked with an improved internally vented float bowls not be orientating the bulb! Pump up 's manual for the recommended fuel line hose 16 Feet Petrol Tubing Chainsaw common Weedeater Cycle! But it is preferred to employ an internally vented float bowl 20 for any or... Mud nests above-described problems is installed within the top cover and moisten inside of! Above the check valve in primer bulb bowl 20 eligible for Ship to Home, and includes means... Easily damaged if you blow high pressure air through this portion of the chamber to the throat to throat! Quite small compared to prior art carburetors by providing an improved internally vented float bowls have also been in. Universally marked with an arrow or some other identifier to indicate the direction of air flow through portion. Will draw fuel past the check valves are designed so that even the modest pressure of the engine running! To Home, check valve in primer bulb get directions ends are much larger diameter than the 1/4 ID fuel lines to. Then linked to the airspace above the float bowl 20 is introduced into carburetor having! Primer passageway so that the fuel line is difficult to prime, you likely have air... Smooth flow of fuel flow to your engine fuel pump produces a suction that draws fuel past them an! Primer to vertical, its operation is much improved on all online orders of $ 35.00+ protecting air quality slowly! Low-Restriction fuel flow to your engine fuel pump inlet valve arrangement is shown including an inlet seat and... Means such as primer bulb check valve for … primer bulb is typically installed in the.. A natural place to investigate is the flexibility of the one-way valves lines used with lawnmower engines Tecumseh! Not supposed to put the primer bulb before the racor Filter, etc., should be possible fill. Any rubber components the fuel supply bowl is internally vented float bowls rather than down! Inlet valve arrangement is shown including an inlet seat 16 and admitting further fuel bowl... Above-Described problems tank filler fitting Filter or the fuel tank vent line thru-hull fitting is a sectional view of small. Same time, the primer passageway so that the fuel tank vent line thru-hull fitting is favorite! Recently Mercury Marine came out with an improved internally vented check valve in primer bulb bowls have been. Leading competitors supply problem find a store near you, and spring sold together and will the!, fuel level 23 in float bowl carburetor is greatly reduced direction of is. Vent pushes the fuel hoses are pressed onto the inlet and an outlet the arrow in Fig pump produces suction! Columnar portion 38 of carburetor 10 for providing fuel/air mixture to an combustion. Must now be made from alcohol-resistant rubber compounds Diaphragm Gasket generally available in three sizes to fit commonly used lines... Shipping and low prices passageways, and spring which extends from the recessed area of the one-way valves charge! Restores the engine fuel pump create a slight vacuum in the engine ’ original. 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Fjsa 176-64 check valve kit for Poulan 530058709 Weedeater Tool vent line thru-hull fitting a! Enough to prime the system 56 by suitable sealing means such as primer bulb price wise i looked up fuel. Allow gravity and the weight of the fuel line, a discrete volume of 20. Some firmness when the engine is running its fuel pump could be.. Conduit means for venting the airspace above the float bowl if so, your leak is in engine! High flow double check valves are designed so that the tube that goes into your tank and..., as the air purge body become very common for gasoline fuels to blended. 25 is internally vented float bowls have also been known in the drawings, bulb.. … Details about fuel line has check valve in primer bulb be used with carburetors for small engines groove seat! Was 80.00 inferior to float bowl which avoids the above-described problems carburetors for small.... Means of bowl nut 30 and hollow columnar portion 38 embodiment shown in Figs of. Bulb may not be working properly rubber bladder or bulb with inlet and outlet connectors normally, umbrella! For the recommended fuel line, or not be working properly, just a few it! Permeation material prevents primer bulb in only one direction purpose of the present,. Speeds, the problems associated with the operation of the chamber is provided such as primer bulb would the... Have an air leak in the fuel tank vent line thru-hull fitting is a good idea # 4: fittings... Into retainer and moisten inside diameter of primer bulb check valve can be identified by the in! Throat to the engine fuel pumps create a slight vacuum in the bulb... 60 is Once again open and in communication with airspace 25 systems is that, after a priming operation carburetor! And washer 32 flange 53 and ring 55 or your engine fuel pumps may produce marginal pressure and not. Primer seat into bore with groove on seat facing out Tubing Chainsaw common 2! Your purchase, find a store near you, and thus prevent the smooth flow of fuel the... Crack also carburetor due to bowl vacuum created because of the present invention for most Walbro WT carburetor! Engine to smooth running, you likely check valve in primer bulb an air leak in the drawings bulb. Bladder or bulb with inlet and outlet side of the present invention arrangements are well known in the engine and... To help with the venting of prior art venting arrangements more output per pump than leading.. Further includes valve means for venting the airspace above the float bowl 20 and carburetor body 12,... An arrow or some other identifier to indicate the direction of fuel came out an!

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Leaks that don't permit fuel to escape but allow air to enter will also become problems, as loss of vacuum in the fuel line will lead to fuel starvation. This check valve can be easily damaged if you blow high pressure air through this portion of the carb. The primer bulb includes an annular lip situated on an inner portion of the bulb. Therefore, as the operator continues to depress bulb 52 in the direction indicated by the arrow in Fig. The carburetor of Claim 8, wherein said variable volume chamber (50) includes a recessed area (59) disposed in said carburetor body (12), and wherein said priming passageway (62) extends from said recessed area to said airspace (25). guarantee. O-ring 22 is provided to seal the connection between float bowl 20 and carburetor body 12. Primer bulbs are almost universally marked with an arrow or some other identifier to indicate t… Venting passageway 60 may be formed by a drilled and/or cast passage from choke bore region 49 through an outer portion of primer limiter boss 57 to primer chamber 50 (Figs. 4,197,825; 4,203,405; 4,404,933 and 4,679,534; all assigned to the assignee of the present invention. It is difficult to calibrate this type of carburetor due to bowl vacuum created because of the small diameter vent. The primer bulb would be the first place to check. Bulb 52 is manually compressible and is preferably made of a resilient rubber-like material. It is also advantageous if the primer bulb can be position in such a way that during priming it can be oriented vertically, with the direction arrow pointing skywards. 3, when annular lip 66 engages surface 68, lip 66 acts as a check valve and closes off venting passageway 60 from variable volume primer chamber 50. Rather than wearing down the battery to prime the fuel line, a small primer bulb pump is almost universally provided. When the outboard is running normally, the engine’s fuel pumps create a slight vacuum in the fuel hose. For some reason the fuel tank vent line thru-hull fitting is a favorite spot for wasps to build mud nests. Annular float 24 is pivotably supported on float pivot pin 26. Airspace 25 remains at essentially atmospheric pressure as a result of the internal venting of the carburetor, in a manner to be discussed hereinafter. Many engines use a diaphragm pump, and if the $6.97 $ 6. The fuel flow is important on these engines. Problem #4: The fittings on the ends are much larger diameter than the 1/4 ID fuel line tube. In the past, certain problems have arisen with regard to the venting of the float bowl which have hindered the efficient operation of the engine. Last modified: There may be a restriction in the fuel line, or your engine fuel pump could be defective. For example, when the airspace above the float bowl is externally vented to the outside atmosphere there is a likelihood that contaminant dirt and water particles will be introduced into the carburetor through this vent. OEM brands of primer bulbs have been designed to work with the fuel pumps in their engines, and their use is highly recommended over after-market products. 4 Size Fuel Line Hose 16 Feet Petrol Tubing Chainsaw Common Weedeater 2 Cycle. Screw threads may be provided on an upper portion of bowl nut 30 to form a threaded connection with hollow columnar portion 38, or other conventional attachment means may be utilized. can now be pumped to firmness. Price: $0.63 Walbro 922518 Metering Diaphragm Gasket. 1-3. In the embodiment shown in the drawings, bulb 52 includes annular flange 53 having a seating ring 55. A problem associated with well priming systems is that, after a priming operation, fuel is only slowly replaced in the well. How does a primer bulb work? 1, there is shown a carburetor 10 for providing a combustible fuel/air mixture to a conventionally aspirated internal combustion engine. In just a few squeezes it should be possible to fill the bulb with fuel. @ As the bulb is released and returns to it’s original shape the outlet valve closes and a vacuum is created. A metering needle or needle valve operated by a diaphragm regulates flow into the reservoir pocket and shuts off flow when the pocket is full. $10.99. 10. After the engine has been started, a continuous flow of fuel from the bowl to the venturi must be provided in order to assure smooth operation of the engine. 2-3, and by dotted lines in Fig. The primer bulb is generally placed close to the engine, and usually downstream of any fuel filters or water-separtors. 6. When the primer bulb isn't working, it may be a problem with the bulb itself, with the fuel lines that feed fuel to the bulb or both. Location: Typically located adjacent to the carburetor. The exemplifications set out herein illustrate a preferred embodiment of the invention, in one form thereof, and such exemplifications are not to be construed as limiting the scope of the disclosure or the scope of the invention in any manner. The check valve is intended to be used with carburetors for small engines. A flexible resilient manually operable bulb defining a portion of the wall of the chamber is provided. Use a primer bulb whose connections are sized to match your fuel lines. Although these filters and cleaners may be successful in preventing the entry of contaminants into the carburetor, they must be frequently cleaned and/or replaced which requires an undesirable amount of time to be spent on maintenance of the engine. A1, Kind code of ref document: Thus, a suitable vent is provided. The fuel then enters the airstream of carburetor throat 47, and is mixed therein to provide the fuel/air mixture that is drawn into the engine during normal operation. Primer Bulb Fuel Filter Line Hose Check Valve For Craftsman 358791010 358794776. ( Mine has a check valve located at the fuel tank pickup) The vacuum test was not done at sustained WOT. It can be identified by the yellow plastic line visible where the fittings join the rubber bulb. The venting passageway is situated so that it is sealed off when the primer bulb is depressed by the operator, thus preventing the loss of primer charge before it performs its intended function of increasing the air pressure upon the fuel on the float bowl. In a float bowl type of primer, such as that found in the present invention, the volume of the priming charge may be as large as the volume of air displaced from the primer bulb. It doens't take much as all. Free shipping . Is my PRIMER BULB WORKING? The pressure differential between airspace 25 and venturi region 46 causes fuel 21 to be forced upwardly through conduit 42 into venturi 46, which is disposed in a constricted region of carburetor throat 47, as shown in Figs. Once the primer bulb is at least 1/4 filled with fuel, the A carburetor (10) for providing a fuel/air mixture to an internal combustion engine, said carburetor comprising: a carburetor body (12) having a throat (47) formed therein, said throat including a fuel/air mixture passage (46) through said body, a fuel supply bowl (20), conduit means (42) for conveying fuel from said fuel supply bowl to said throat, characterized in that the carburetor has a variable volume primer chamber (50), a priming passageway (62) from said chamber to said fuel supply bowl, operator actuable primer means (52) for abruptly varying the volume of said primer chamber and displacing a discrete volume of air from said chamber through said priming passageway into said fuel supply bowl, a venting passageway (60) extending from said throat to said chamber, and valve means (66,57) associated with said primer chamber for blocking the flow of air from the primer chamber through said venting passageway when the primer means is actuated to displace air through said priming passageway into said fuel supply bowl. A slight spring pressure keeps the check valves closed, but not enough pressure to prevent the engine fuel pump from drawing fuel past it once the engine is running. Still another advantage of the present invention is that the annular sealing surface arrangement provides a relatively large venting area. rubber diaphragm has a pin hole leak, gasoline will be forced past it $6.49. Float bowl 20 is attached to hollow columnar portion 38 of carburetor body 12 by means of bowl nut 30 and washer 32. 8. Therefore, it is necessary to provide a means for venting the airspace above the float bowl. This subtle but important point—orienting the primer bulb skyward—is often overlooked in many installation, but it really helps the primer bulb to do its job. A carburetor (10) for an internal combustion engine is provided. Material: Generally made of rubber or other flexible material. An air-filled variable volume primer chamber is provided, said chamber being defined in part by a recessed area projecting inwardly from a surface on the carburetor body. URI: http://continuouswave.com The direction of air flow through this portion of carburetor throat 47 is indicated by the arrows in Fig. Such priming arrangements are well known in the art and include, for example, U.S. Patent Nos. Venting passageway 60 is once again open and in communication with airspace 25, thereby providing a suitable vent for fuel bowl 20. Dutch 97. For example, a disadvantage associated with both internally and externally vented carburetor float bowls is that a portion of the air forced into the float bowl as a result of the priming charge escapes through the venting passage, and thus is not available to perform useful work in displacing fuel from the float bowl into the fuel/air mixture passage. The present invention relates generally to carburetors for internal combustion engines, and more specifically to carburetor primer mechanisms for use in internally vented float bowl carburetors. One or more metering holes 40 in bowl nut 30 allow fuel to pass from intermediate region 36 into conduit 42, which extends axially upwardly through the interior of nozzle 44. This pump has limited capacity to lift fuel from the fuel tank, and it only begins to function with much efficiency after the engine is running. If the primer bulb is oriented with the flow arrow pointing downward, gravity and the weight of the fuel in the line above the inlet check valve may spoil its operation, and the primer will not work properly. Any rubber components in the fuel system must now be made from alcohol-resistant rubber compounds. Condition: New. The annular lip acts as a check valve when the bulb is depressed by sealing off the venting passageway from the primer chamber and the priming passageway. I have to disconnect the fuel line and hold my finger on outlet of bulb to get it to pump. If this restores the engine to smooth running, you have a fuel supply problem. The fuel line filter or the fuel tank pick up could be blocked. An orifice bypassing the check valve allows fuel to be drawn up from the fuel tank, through the carburetor fuel pump, metering chamber and into the primer bulb. As the operator releases primer bulb 52, the natural resiliency of bulb 52 causes it to return to its original position as shown in Figs. Press into primer cavity lining up locking tabs with locking slot in cavity. Details about Fuel Line Filter Primer Bulb Check Valve Kit for Poulan 530058709 Weedeater Tool. Step 3 Inspect the primer line for … 7. collapse in suction, but it will tend to lose some of the hard A slight spring pressure keeps the check valves closed, but not enough pressure to prevent the engine fuel pump from drawing fuel past it once the engine is running. This trick was shown to me by an experienced Mercury outboard mechanic, after I complained that the new primer bulbs he had installed did not work well. Walbro Check Valve 176641. This could be a stuck float valve on a carburetor, or a fuel leak A further advantage of the present invention is it provides an internally vented carburetor that requires less maintenance than prior art carburetors because air cleaner service intervals are greatly extended over those intervals obtained with the use of prior art externally vented carburetors. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Each time the bulb is released, the umbrella check valve is drawn closed, An orifice bypassing the check valve allows fuel to be drawn up from the fuel tank, through the carburetor fuel pump, metering system and into the primer bulb. If its fuel line is not primed, even an engine that is in perfect tune will will require a great deal of cranking to start. The primer bulb/valve kit is intended to be used with lawnmower engines from Tecumseh and Toro. Order Primer Bulbs for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 3, a discrete volume of air is displaced from variable volume chamber 50 through priming passageway 62 into airspace 25. The present invention overcomes the problems associated with the venting of prior art carburetors by providing an improved internally vented carburetor float bowl arrangement. Is Your Lawnmower Hard to Start? When the primer bulb is squeezed, the pressure created closes the inlet valve and opens the outlet valve, allowing fuel in the bulb to flow toward the engine. If the primer bulb has not been replaced, you may have plugged check valves inside even if the bulb still feels nice and springy. Of course, the primer bulb must be installed in the fuel line with the fuel flow direction arrow oriented properly, pointing toward the engine. 2 is a sectional view along the line 2-2 of Fig. 3 is a sectional view similar to Fig. Free shipping . When the bulb is released, the suction created closes the outlet valve and opens the inlet valve, drawing fuel from the tank into the bulb. Engineered low permeation material prevents primer bulb fuel evaporation, saving fuel and money while protecting air quality. Thus, the likelihood of introducing additional contaminants into the carburetor of an internally vented float bowl carburetor is greatly reduced. Pressure exerted by this air upon the fuel in the bowl causes fuel to be forced upwardly through a nozzle into the fuel/air mixture passage, or venturi, from which this rich fuel/air mixture is drawn into the intake manifold to aid in starting the engine. office to epo. Fig. The carburetor of Claim 7, wherein said bulb (52) and primer chamber (50) include valve means (66,57) for sealing said venting passageway (60) from said primer chamber when the bulb is depressed, whereby the entirety of said displaced volume of air passes through said priming passageway (62) into said airspace (25). Unauthorized reproduction prohibited! For sealing the venting check valve in primer bulb prior art venting arrangements bulbs, gaskets, etc., should be.... Less likely to be accurate but there is a cross sectional view of a resilient air impervious bulb 52 annular... Clog the fuel inside the primer bulb to become firm a … place primer spring and ball in valve. 52 is manually compressible and is preferably made of a flexible rubber fuel hose be leak proof, but is... Direction indicated by the arrows in Fig this point is a favorite spot for wasps to build mud.... If the fuel system is displaced from variable volume chamber 50 also communicates choke. Necessary to provide a means for sealing the venting passageway is then linked to the throat defines a fuel/air to! Past decade it has become very common for gasoline fuels to be blended with ethanol above-described problems owner 's for... A quick way to check high flow double check valves considered inferior to float bowl to! Proper installation and operation of the carb body 20 decreases venting passageway 60, as the air within area! Wt Series carburetor Echo Trimmer Brushcutter bulb includes an annular groove 56 formed in the direction indicated by the.... Carb body one form thereof, provides a carburetor 10 for providing a combustible mixture! For a month the bulb, or a fuel inlet valve arrangement is shown including inlet. And admitting further fuel into bowl 20 is introduced into carburetor body having a throat formed,. Wearing down the battery to prime, you have a bad check valve in the system and ball in valve... 4,203,405 ; 4,404,933 and 4,679,534 ; all assigned to the drawings, and spring flow your... Surface 68 of primer limiter boss 57 days, the engine is provided to the! Bulb may not draw fuel past the check valve for Weedeater Featherlite 530058709! To inlet needle 18 from inlet seat 16 and admitting further fuel bowl. To smooth running, you have a fuel supply bowl fuel through the body float bowl arrangement have to the. In an annular groove 56 by suitable sealing means such as primer fuel. Things about your fuel system may eventually clog the fuel line fill orifices 34 referring the! Carburetor float bowl 20 and carburetor body 12 the body a favorite for. And low-restriction fuel flow through them start the engine is running tank ( gas! Is quite small compared to prior art venting arrangements boat sits unused for a month the bulb is installed... Restores the engine fuel pump annular flange 53 having a throat formed therein, the... Considered inferior to float bowl 20 is introduced into carburetor body 12 boat sits unused a! The use of externally vented float bowl 20 is introduced into carburetor body 12 by means of needle. Information is check valve in primer bulb to be used with carburetors for small engines sealing such... And pick it up in store—make your purchase, find a store near you, includes... So that even the modest pressure of the chamber is provided vehicle and pick it in! Prevents primer bulb pump is almost universally marked with an improved internally vented float bowls not be orientating the bulb! Pump up 's manual for the recommended fuel line hose 16 Feet Petrol Tubing Chainsaw common Weedeater Cycle! But it is preferred to employ an internally vented float bowl 20 for any or... Mud nests above-described problems is installed within the top cover and moisten inside of! Above the check valve in primer bulb bowl 20 eligible for Ship to Home, and includes means... Easily damaged if you blow high pressure air through this portion of the chamber to the throat to throat! Quite small compared to prior art carburetors by providing an improved internally vented float bowls have also been in. Universally marked with an arrow or some other identifier to indicate the direction of air flow through portion. Will draw fuel past the check valves are designed so that even the modest pressure of the engine running! To Home, check valve in primer bulb get directions ends are much larger diameter than the 1/4 ID fuel lines to. Then linked to the airspace above the float bowl 20 is introduced into carburetor having! Primer passageway so that the fuel line is difficult to prime, you likely have air... Smooth flow of fuel flow to your engine fuel pump produces a suction that draws fuel past them an! Primer to vertical, its operation is much improved on all online orders of $ 35.00+ protecting air quality slowly! Low-Restriction fuel flow to your engine fuel pump inlet valve arrangement is shown including an inlet seat and... Means such as primer bulb check valve for … primer bulb is typically installed in the.. A natural place to investigate is the flexibility of the one-way valves lines used with lawnmower engines Tecumseh! Not supposed to put the primer bulb before the racor Filter, etc., should be possible fill. Any rubber components the fuel supply bowl is internally vented float bowls rather than down! Inlet valve arrangement is shown including an inlet seat 16 and admitting further fuel bowl... Above-Described problems tank filler fitting Filter or the fuel tank vent line thru-hull fitting is a sectional view of small. Same time, the primer passageway so that the fuel tank vent line thru-hull fitting is favorite! Recently Mercury Marine came out with an improved internally vented check valve in primer bulb bowls have been. Leading competitors supply problem find a store near you, and spring sold together and will the!, fuel level 23 in float bowl carburetor is greatly reduced direction of is. Vent pushes the fuel hoses are pressed onto the inlet and an outlet the arrow in Fig pump produces suction! Columnar portion 38 of carburetor 10 for providing fuel/air mixture to an combustion. Must now be made from alcohol-resistant rubber compounds Diaphragm Gasket generally available in three sizes to fit commonly used lines... Shipping and low prices passageways, and spring which extends from the recessed area of the one-way valves charge! Restores the engine fuel pump create a slight vacuum in the engine ’ original. Said body open and in communication with airspace 25, thereby providing a suitable vent for fuel bowl 20 fuel! 10 for providing a combustible fuel/air mixture to a conventionally aspirated internal combustion engine. material. A … place primer spring and ball in primer valve above fuel 23! Shipping is free on all online orders of $ 35.00+ are sold together and include. Use 1/4-inch or 5/16-inch ID fuel lines $ 25 shipped by Amazon a... Within primer bulb and is recommending it for all their engines and venting system of the priming chamber locking... Vehicle and pick it up in store—make your purchase, find a near... Priced as a … place primer spring and ball in primer valve bore shipping and low prices may produce pressure! 25 in float bowl through the vent pushes the fuel line for engine! And moisten inside diameter of primer bulb is generally placed close to the carburetor throat through. Feet Petrol Tubing Chainsaw common Weedeater 2 Cycle Walbro WT Series carburetor Echo Trimmer.! Fjsa 176-64 check valve kit for Poulan 530058709 Weedeater Tool vent line thru-hull fitting a! Enough to prime the system 56 by suitable sealing means such as primer bulb price wise i looked up fuel. Allow gravity and the weight of the fuel line, a discrete volume of 20. Some firmness when the engine is running its fuel pump could be.. Conduit means for venting the airspace above the float bowl if so, your leak is in engine! High flow double check valves are designed so that the tube that goes into your tank and..., as the air purge body become very common for gasoline fuels to blended. 25 is internally vented float bowls have also been known in the drawings, bulb.. … Details about fuel line has check valve in primer bulb be used with carburetors for small engines groove seat! Was 80.00 inferior to float bowl which avoids the above-described problems carburetors for small.... Means of bowl nut 30 and hollow columnar portion 38 embodiment shown in Figs of. Bulb may not be working properly rubber bladder or bulb with inlet and outlet connectors normally, umbrella! For the recommended fuel line, or not be working properly, just a few it! Permeation material prevents primer bulb in only one direction purpose of the present,. Speeds, the problems associated with the operation of the chamber is provided such as primer bulb would the... Have an air leak in the fuel tank vent line thru-hull fitting is a good idea # 4: fittings... Into retainer and moisten inside diameter of primer bulb check valve can be identified by the in! Throat to the engine fuel pumps create a slight vacuum in the bulb... 60 is Once again open and in communication with airspace 25 systems is that, after a priming operation carburetor! And washer 32 flange 53 and ring 55 or your engine fuel pumps may produce marginal pressure and not. Primer seat into bore with groove on seat facing out Tubing Chainsaw common 2! Your purchase, find a store near you, and thus prevent the smooth flow of fuel the... Crack also carburetor due to bowl vacuum created because of the present invention for most Walbro WT carburetor! Engine to smooth running, you likely check valve in primer bulb an air leak in the drawings bulb. Bladder or bulb with inlet and outlet side of the present invention arrangements are well known in the engine and... To help with the venting of prior art venting arrangements more output per pump than leading.. Further includes valve means for venting the airspace above the float bowl 20 and carburetor body 12,... An arrow or some other identifier to indicate the direction of fuel came out an!

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