check valve in primer bulb

Known priming arrangements are frequently in the form of an operator actuable bulb which, when depressed, displaces a volume of air into the airspace above a carburetor float bowl or fuel well. Dutch Therefore, airspace 25 is internally vented through choke bore region 49 of carburetor throat 47. 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. Compatible with ethanol blended fuels. It can be identified by the yellow plastic line visible where the fittings join the rubber bulb. Any rubber components in the fuel system must now be made from alcohol-resistant rubber compounds. 2-3, and by dotted lines in Fig. $3.99/ea. The inlet and outlet fittings typically contain a hose barb and these are generally available in three sizes to fit commonly used fuel lines. The carburetor of Claim 1, wherein said primer means comprises a flexible bulb (52), said bulb and primer chamber (50) form said valve means, and said valve means comprises an annular lip (66) disposed on an inner portion of said bulb and wherein a recessed area (59) projects inwardly from a surface (57) disposed on said carburetor body (12), said annular lip being aligned opposite said surface and having a circumference greater than the circumference of said recessed area so that when said bulb is depressed the annular lip engages said surface surrounding said recessed area, thereby sealing said venting passageway (60) from the primer chamber. 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. Another advantage of the present invention is that it provides an internally vented bowl carburetor whereby dirt and other contaminants are not introduced into the carburetor through the vent opening. 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. 2 is a sectional view along the line 2-2 of Fig. This prevents rich operation of the carburetor. As shown in Fig. This venting may be either internal whereby the air supply to the vent is drawn from the throat of the carburetor, or external whereby the venting air is supplied from the atmosphere external to the carburetor. Primer chamber 50 communicates with choke bore region 49 of carburetor throat 47 through venting passageway 60, as shown in Figs. $6.82. The primer bulb includes an annular lip situated on an inner portion of the bulb. 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. 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 items within the kit are sold together and will include the bulb, seal, valve, and spring. A problem associated with well priming systems is that, after a priming operation, fuel is only slowly replaced in the well. In small internal combustion engines, and in particular those engines which are started by hand cranking, it is frequently desirable to prime the engine by introducing a fuel-rich mixture into the engine intake system to aid in starting the engine. The check valve is intended to be used with carburetors for small engines. A fuel inlet valve arrangement is shown including an inlet seat 16 and an inlet needle 18. This makes a natural place to connect a primer bulb. 2, wherein the primer bulb has been depressed by the operator, thereby closing off the venting passageway from the primer chamber; and. Boats with on-deck fuel tanks may have the primer bulb located at the tank end of the fuel line. 4 is an end view of the primer bulb of the present invention. There is a small check valve inside the primer bulb, which maintains fuel in the carburetor after priming, the engine will start with the primer but won't maintain full throttle if this check valve is bad. running. Externally vented float bowls have been reported in the prior art that include air filters and cleaners in an attempt to solve the problems associated with contaminants entering the carburetor. 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. Therefore, it is necessary to provide a means for venting the airspace above the float bowl. Buckda: posted 05-19-2006 05:15 PM ET (US) can now be pumped to firmness. The venting passageway communicates with the primer passageway so that the fuel supply bowl is internally vented to the throat. The sealing off of venting passageway 60 by check valve 66 prevents a loss of the priming charge through this passageway, and insures that substantially all of the priming charge passes into airspace 25 to perform useful work in forcing the fuel charge into venturi 46. Kind code of ref document: DISCLAIMER: This information is believed to be accurate but there is no 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. You are not supposed to put the primer bulb before the racor filter. At the same time, the pressure in airspace 25 directly above fuel level 23 in float bowl 20 is at essentially atmospheric pressure. It goes without saying the engine fuel system must be leak proof, but it is also necessary that it be air-tight as well. A priming passageway extends from the recessed area of the chamber to the airspace in the fuel supply bowl. This is especially common on boats that have internal fuel tanks. ... Walbro 188121 Primer Bulb. This could be a stuck float valve on a carburetor, or a fuel leak 4 Size Fuel Line Hose 16 Feet Petrol Tubing Chainsaw Common Weedeater 2 Cycle. The percentages are high that the problem lies from the check valve back to the gas…although a leak or clog anywhere in the line will cause what you’ve described. $6.50. Free shipping . 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. The bulb is adapted to be depressed to abruptly reduce the volume of the chamber and cause a discrete volume of air from the chamber to pass through the priming passageway into the airspace. You have a bad check valve in the carb body. It is difficult to calibrate this type of carburetor due to bowl vacuum created because of the small diameter vent. 530058709 Primer Bulb Fuel Filter Line Hose For Poulan Craftsman Weed Eater . As the bulb fills its resistance to squeezing changes, and the firmness of the bulb signals the operator when the primer has done its job and primed the fuel line. 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. Problem #3: This primer has significant resistance to forward flow of fuel. 69000151, Country of ref document: Is Your Lawnmower Hard to Start? The direction of air flow through this portion of carburetor throat 47 is indicated by the arrows in Fig. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. This application is therefore intended to cover any variations, uses or adaptations of the invention following the general principles thereof and including departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and fall within the limits of the appended claims. A venting passageway extends from the carburetor throat to the primer chamber. Thus fuel can flow easily through the primer bulb in only one direction. The bulb further includes valve means for sealing the venting passageway from the primer chamber when the bulb is depressed. Press into primer cavity lining up locking tabs with locking slot in cavity. Thus, the effec­tiveness of the priming charge has been diluted. A primer bulb is included which helps to … Referring to the drawings, and particularly to Fig. 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. Atmospheric pressure in the tank through the vent pushes the fuel from the tank to the engine. As fuel is consumed by the engine, fuel level 23 in float bowl 20 decreases. $6.97 $ 6. The present invention, in one form thereof, provides a carburetor for providing fuel/air mixture to an internal combustion engine. 1, there is shown a carburetor 10 for providing a combustible fuel/air mixture to a conventionally aspirated internal combustion engine. Accordingly, it is preferred to employ an internally vented float bowl which avoids the above-described problems. 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. The primer bulb/valve kit is intended to be used with lawnmower engines from Tecumseh and Toro. Check all fuel hose connections. 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). URI: http://continuouswave.com If you have a fuel disconnect downstream of the primer bulb, The primer bulb is also a diagnostic tool that will tell you a number of things about your fuel system. 3, a discrete volume of air is displaced from variable volume chamber 50 through priming passageway 62 into airspace 25. $10.99. Duckbill Valve, Umbrella Valve, Plastic Check Valve manufacturer / supplier in China, offering Primer Bulb OEM 41331212700 for Walbro Poulan, Good Quality Carburetor Oil Bulb for Chainsaws Tool Parts, Mjt1007 Bulb for Homelite Echo Sthl Ryobi Poulan Carburetor and so on. Primer limiter boss 57 is defined in pocket 54 by annular groove 56, and has a generally cylindrical recessed area 59 disposed therein as shown in Figs. 4.3 out of 5 stars 28. 2. ( Mine has a check valve located at the fuel tank pickup) The vacuum test was not done at sustained WOT. If the fuel line is difficult to prime, you likely have an air leak in the system. 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. High output primer bulb-60% more output per pump than leading competitors. Is my PRIMER BULB WORKING? Primer bulb 52 has annular lip 66 disposed along an inner portion of bulb 52. Bulk savings: Buy 1. This item fits into the center of the air purge body. into the engine crankcase. The increase in pressure generated in airspace 25 by this displaced volume of air acts upon fuel 21 in float bowl 20 and causes it to be forced upwardly into venturi region 46 of the carburetor to form a rich fuel/air mixture that is drawn into the intake manifold to aid in starting the engine. 1-2 that choke bore region 49 of carburetor throat 47 is in communication with airspace 25 via venting passageway 60, primer chamber 50 and primer passageway 62, respectively. firmness it had when initially primed. In the past decade it has become very common for gasoline fuels to be blended with ethanol. Price: $2.75 Walbro 922258 Pump Gasket. Replace them if they are even slightly suspect. Annular lip 66 is situated opposite surface 68 of primer limiter boss 57. The ring holds down the carburetor bulb and seals it. Bulb 52 is manually compressible and is preferably made of a resilient rubber-like material. DE, Date of ref document: If the bulb … Fuel is drawn upwardly through conduit 42 into the fuel/air mixture passage at venturi 46 by means of the lower pressure that exists in the region of the venturi, compared to that in fuel bowl 20. Fig. A blocked fuel tank vent could also cause this. Insert primer bulb into retainer and moisten inside diameter of primer bulb. 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. $3.79/ea. Quantity: 3 or more for $3.75/ea. Many engines use a diaphragm pump, and if the The carburetor of Claim 9, wherein said valve means comprises an annular lip (66) disposed on an inner portion of said bulb (52), and wherein said recessed area (59) projects inwardly from a surface (57) disposed on said carburetor body (12), said annular lip being aligned opposite said surface and having a circumference greater than the circumference of said recessed area so that when said bulb is depressed the annular lip engages said surface surrounding said recessed area, thereby sealing said venting passageway (60) from the primer chamber (50). Unlike your automobile engine, which typically has an electrical fuel pump located in the fuel tank itself that delivers fuel under pressure to the engine, most outboard motors have only a simple diaphragm fuel pump that operates from engine vacuum. Thus, when the air cleaner becomes clogged and the pressure within the carburetor throat decreases, the pressure above the fuel in the float bowl also decreases due to the passageway connecting the carburetor throat and bowl. Flange 53 is retained in groove 56 by suitable sealing means such as primer bulb retainer ring 58. The primer bulb would seem like a simple device that does not require a great deal of explanation, but there are several details of its installation and use that may be overlooked. 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. One advantage of the present invention is that it provides an effective vent for a carburetor bowl that includes a check valve so that the priming charge is not lost through the vent. Walbro Check Valve 176641. Thus, the likelihood of introducing additional contaminants into the carburetor of an internally vented float bowl carburetor is greatly reduced. If this happens even at idle speeds, the primer bulb may not be working properly. A further disadvantage to externally vented carburetors is that when the air cleaner becomes dirty and clogged, the difference between the air pressure in the carburetor throat and the ambient air pressure will cause the engine to run rich. 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). If you can fill the bulb with fuel but it never gets firm, Once the primer bulb is at least 1/4 filled with fuel the engine is ready wadoy 188-12 Primer Bulb with 177-64 Check Valve for Most Walbro WT Series Carburetor Echo Trimmer Brushcutter. 19920723, Owner name: When the outboard is running normally, the engine’s fuel pumps create a slight vacuum in the fuel hose. Price wise I looked up the part#and was 80.00. Details about Fuel Line Filter Primer Bulb Check Valve Kit for Poulan 530058709 Weedeater Tool. Of course, the primer bulb must be installed in the fuel line with the fuel flow direction arrow oriented properly, pointing toward the engine. I will pass on this information, could be a bad check valve in primer bulb but min has a redundent check valve in the fuel line which has already been replaced. Author:James W. Hebert collapse in suction, but it will tend to lose some of the hard 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. A variable volume primer chamber 50 is provided. How does a primer bulb work? These contaminants may eventually clog the fuel and air passageways, and thus prevent the smooth flow of fuel to the venturi. A flexible resilient manually operable bulb defining a portion of the wall of the chamber is provided. This air exerts pressure on the fuel which forces the fuel upwardly through a conduit into the venturi, where it is mixed with air and then drawn into the intake manifold of the engine. If your engine begins to stall or run roughly several minutes after starting and when running at higher speeds, use the primer bulb to force fuel to the engine. I understand that bulb will not be hard while running. If the primer bulb collapses after the engine has been running or stays collapsed while priming this indicates a fuel line restriction upstream from 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. Order Primer Bulbs for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. Venting passageway 60 is once again open and in communication with airspace 25, thereby providing a suitable vent for fuel bowl 20. This item is used to allow the purge bulb to force air through the check valve causing fuel be drawn from the tank to the fuel pump and through the carburetor. In order to attempt to eliminate this loss of priming charge, the type of internal vent that is generally found in the art is necessarily of small diameter in order to hinder this loss of the priming charge. 4. 9. How easily is the primer bulb pumping up the fuel ? Airspace 25 remains at essentially atmospheric pressure as a result of the internal venting of the carburetor, in a manner to be discussed hereinafter. A likely place to investigate is the fuel disconnect on the engine. Fig. Inlet needle 18, at a certain point in its upward movement, will close off the fuel inlet supply by seating on inlet seat 16. Recently Mercury Marine came out with an improved primer bulb and is recommending it for all their engines. Float 24 is connected to inlet needle 18 by means of inlet needle clip 28. 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. Get it as soon as Wed, Jan 6. Preferably chamber 50 is formed by sealingly seating a resilient air impervious bulb 52 in a pocket 54 in carburetor body 12. 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