2. 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. A blocked fuel tank vent could also cause this. Thus, as previously discussed, a portion of the priming charge will escape from the airspace above the float bowl through this internal vent, thereby diluting the effectiveness of the primer. Is my PRIMER BULB WORKING? Fuel Line Filter Primer Bulb Check Valve Kit for Poulan 530058709 Weedeater Tool. 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. Therefore, airspace 25 is internally vented through choke bore region 49 of carburetor throat 47. Almost all primer bulbs consist of a flexible rubber bladder or bulb with inlet and outlet connectors. the pump body and out the overflow tube. $10.99. The carburetor further comprises a fuel supply bowl, and includes conduit means for conveying fuel from the fuel supply bowl to the throat. 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. 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. Bulk savings: Buy 1. Material: Generally made of rubber or other flexible material. 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. Primer bulbs are almost universally marked with an arrow or some other identifier to indicate t… $3.79/ea. This article first appeared February 22, 2004. Most primer bulbs will lose some firmness when the engine is The first two patents listed above illustrate priming arrangements wherein fuel is displaced from a fuel well, whereas the latter two patents illustrate priming arrangements wherein the air displaces fuel from the float bowl. Be sure the connector is properly seated and is making an air-tight connection. Dutch If the lines are properly installed and the fuel filter has free flow, about the only thing that will prevent the primer bulb from operating is a faulty check valve in the portion of the carb immediately below the primer bulb. Therefore, if the operator attempts to prime the engine in rapid succession, no fuel is present in the well after the first priming operation so that the only effective priming operation is the first such operation. collapse in suction, but it will tend to lose some of the hard disconnect the fuel line from the engine and see if the primer The primer bulb is best installed where it can be easily accessed for operation. Atmospheric pressure in the tank through the vent pushes the fuel from the tank to the engine. a primer bulb to become firm. Many new engines are delivered without a fuel disconnect fitting, and instead just provide a short stub of fuel line from the engine cowling. 2, 3). 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. Get it as soon as Wed, Jan 6. As previously described, with prior art carburetors of this type, a portion of the primer charge would ordinarily escape through the venting passageway before it had performed useful work in forcing the fuel from the bowl to the venturi. Primer chamber 50 also communicates with airspace 25 in float bowl 20 through priming passageway 62. Venting passageway 60 is once again open and in communication with airspace 25, thereby providing a suitable vent for fuel bowl 20. 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 problem associated with well priming systems is that, after a priming operation, fuel is only slowly replaced in the well. The fuel hoses are pressed onto the inlet and outlet fittings and retained with clamps. This makes a natural place to connect a primer bulb. $6.49. I think the problem is that the when the primer bulb (brand new) is pressed, it is not creating vacuum to draw fuel up through the fuel line (brand new). 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. you probably have a fuel leak downstream of the primer bulb. 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. You can buy the hose and bulb seperate. 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. If this restores the engine to smooth running, you have a fuel supply problem. body and out the overflow tube. 3. 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. 1, there is shown a carburetor 10 for providing a combustible fuel/air mixture to a conventionally aspirated internal combustion engine. Additional disadvantages have been associated with the use of externally vented float bowls. In addition, a variable volume primer chamber is provided, and a priming passageway is provided that leads from the primer chamber to the fuel supply bowl. 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. During normal engine operation, when air flows through the constricted region of venturi 46, it is at a pressure lower than atmospheric pressure. 2, wherein the primer bulb has been depressed by the operator, thereby closing off the venting passageway from the primer chamber; and. Fig. The items within the kit are sold together and will include the bulb, seal, valve, and spring. 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 present invention, in one form thereof, provides a carburetor for providing fuel/air mixture to an internal combustion engine. One-way check valves are located on the inlet and outlet side of 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. A priming passageway extends from the recessed area of the chamber to the airspace in the fuel supply bowl. In the past decade it has become very common for gasoline fuels to be blended with ethanol. 1 is a cross sectional view of a carburetor employing the priming and venting system of the present invention; Fig. Such priming arrangements are well known in the art and include, for example, U.S. Patent Nos. Furthermore, each prime is limited to the volume of the well, which is quite small compared to the bowl. Any rubber components in the fuel system must now be made from alcohol-resistant rubber compounds. $3.99/ea. 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. 2 is a sectional view along the line 2-2 of Fig. 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. Thus fuel can flow easily through the primer bulb in only one direction. You are not supposed to put the primer bulb before the racor filter. 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. Insert primer bulb into retainer and moisten inside diameter of primer bulb. This will allow gravity and the weight of the fuel inside the primer bulb to help with the operation of the one-way valves. It is desired to provide a vent for a carburetor that is effective in venting a float bowl or fuel well, but does not introduce contaminants into the carburetor or require frequent maintenance of the air filter. 19920723, Owner name: 2-3, and by dotted lines in Fig. Unfortunately, ethanol tends to attack rubber and to reduce its flexibility. LAPSE BECAUSE OF EXPIRATION OF PROTECTION. When the bulb is released, the umbrella check valve is drawn closed. The direction of air flow through this portion of carburetor throat 47 is indicated by the arrows in Fig. Still another advantage of the present invention is that the annular sealing surface arrangement provides a relatively large venting area. While this invention has been described as having a preferred embodiment, it will be understood that it is capable of further modification. The primer bulb is also a diagnostic tool that will tell you a number of things about your fuel system. Reed valves act as check/one way valves to stop gas flowing backwards. The carburetor float bowl (20) is internally vented through a venting path (60,62) that leads from the carburetor throat (47), via the primer chamber (50), to the airspace (25) above the float bowl. A variable volume primer chamber 50 is provided. Order Primer Bulbs for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 6. Float 24 then pivots downwardly, thereby unseating inlet needle 18 from inlet seat 16 and admitting further fuel into bowl 20. The carburetor comprises a carburetor body having a throat formed therein, said throat defining a fuel/air mixture passage through said body. 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. Therefore, as the operator continues to depress bulb 52 in the direction indicated by the arrow in Fig. Primer bulb 52 has annular lip 66 disposed along an inner portion of bulb 52. Float bowl 20 is attached to hollow columnar portion 38 of carburetor body 12 by means of bowl nut 30 and washer 32. Rather than wearing down the battery to prime the fuel line, a small primer bulb pump is almost universally provided. When the bulb is depressed the outlet check valve is forced open and the air and fuel in the bulb passes through the outlet check valve and into the. guarantee. Primer chamber 50 communicates with choke bore region 49 of carburetor throat 47 through venting passageway 60, as shown in Figs. 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. During a priming operation of carburetor 10, primer bulb 52 is depressed by the operator. 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. Price: $2.74 Walbro 188128 PRIMER BULB. Engineered low permeation material prevents primer bulb fuel evaporation, saving fuel and money while protecting air quality. Internally vented carburetor bowls are advantageous with respect to externally vented bowls in that the vent passageway leads from the space above the fuel in the bowl to the throat of the carburetor. 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. wadoy 188-12 Primer Bulb with 177-64 Check Valve for Most Walbro WT Series Carburetor Echo Trimmer Brushcutter. Press primer seat into bore with groove on seat facing out. You could also have a defective primer bulb, or not be orientating the primer bulb properly during priming. 1. The fuel flow is important on these engines. 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. On the manual pumper style carburetors, a pumper bulb is installed within the top cover. Problem #3: This primer has significant resistance to forward flow of fuel. Associated check valves (6) & (7) allow the pump to draw fuel from the lower chamber through the primer passage (1) and output the primer fuel to the return line back to the fuel tank. Primer bulb check valve system for an internally vented bowl primer carburetor, Application filed by Tecumseh Products Co, MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING, COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS, SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF, Carburettors with means for facilitating engine's starting or its idling below operational temperatures, Other means for enriching fuel-air mixture during starting; Priming cups; using different fuels for starting and normal operation, INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL, Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices, Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools, Float-controlled apparatus for maintaining a constant fuel level, Float-controlled apparatus for maintaining a constant fuel level having means for venting float chambers, GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, TECHNICAL SUBJECTS COVERED BY FORMER USPC, TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, LAPSE BECAUSE OF EXPIRATION OF PROTECTION, Balance vent for an internally vented float bowl carbuetor, Internally vented float bowl carburetor having a cold start vent conduit, But carburetor circuit with external ventilation of vapor containment element, Priming system for a vented bowl carburetor, Internally vented float bowl primer arrangement, Primer system and method for priming an internal combustion engine, Purge valve for on board fuel vapor recovery systems, Fuel delivery with self-priming fuel pump, Fuel evaporative emission treatment system, Evaporative fuel-processing system for internal combustion engines, In-tank fuel reservoir with fuel vapor separation, Postgrant: annual fees paid to national office, Lapsed in a contracting state announced via postgrant inform. You have a bad check valve in the carb body. I understand that bulb will not be hard while running. Repeated squeezing causes fuel to be lifted from the tank and pumped to the engine, until the fuel line is filled and the bulb becomes firm. The fuel then passes into intermediate region 36 disposed between bowl nut 30 and hollow columnar portion 38. Press until both tabs re-seated in locking slots. 4 is an end view of the primer bulb of the present invention. This could be a stuck float valve on a carburetor, or a fuel leak How it works: Primer bulb is pressed and released; IS YOUR Briggs and Stratton engine Priming correctly? We do our best! 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. 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. If in doubt replace the primer bulb. 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. Furthermore, the problems associated with externally vented carburetors, such as the introduction of contaminants into the system and/or the increased maintenance required to clean or replace the vent air filter, are avoided. 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 float regulated fuel supply bowl (20) adapted to contain a quantity of liquid fuel (21) and having an airspace (25) above said fuel, a fuel nozzle (44) for conducting fuel from said bowl to said fuel/air mixture passage, characterized in that the carburetor has an air-filled variable volume primer chamber (50), a priming passageway (62) extending from said variable volume chamber to said airspace, a flexible bulb (52) forming a portion of the periphery of said variable volume chamber, said bulb being adapted to be depressed to abruptly vary the volume of said chamber and displace a discrete volume of air from said chamber through said priming passageway into said airspace, and a venting passageway (60) extending from said throat to said primer chamber, said venting passageway communicating with said primer passageway whereby said fuel supply bowl is vented to said throat. in the engine fuel pump. into the engine crankcase. Check all fuel hose connections. A float regulated fuel supply bowl adapted to contain a quantity of liquid fuel and having an airspace above the fuel is provided, along with a fuel nozzle to provide fuel to the mixture passage. Free shipping . In just a few squeezes it should be possible to fill the bulb with fuel. 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. We have the Walbro Check Valve you need with fast shipping and low prices. from nat. Andy-- Once in awhile you will need the primer valve. firmness it had when initially primed. 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). The carburetor comprises a carburetor body having a throat formed therein, whereby the throat defines a fuel/air mixture passage through the body. 3, a discrete volume of air is displaced from variable volume chamber 50 through priming passageway 62 into airspace 25. rubber diaphragm has a pin hole leak, gasoline will be forced past it $6.97 $ 6. Airspace 25 remains at essentially atmospheric pressure as a result of the internal venting of the carburetor, in a manner to be discussed hereinafter. When you operate the primer it is sucking air back through the check valve rather then fuel up through the carb and that is the source of air to pressurize the tank. Under the primer bulb are an inlet and an outlet. Of course, the primer bulb must be installed in the fuel line with the fuel flow direction arrow oriented properly, pointing toward the engine. 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. Older rubber hoses, primer bulbs, gaskets, etc., should be replaced. Don't know much about small engines. Problem #4: The fittings on the ends are much larger diameter than the 1/4 ID fuel line tube. One-way check valves are located on the inlet and outlet side of the primer bulb. O-ring 22 is provided to seal the connection between float bowl 20 and carburetor body 12. Thus, it may be readily observed from Figs. Thus, a suitable vent is provided. 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. A venting passageway is included which extends from the throat to the priming chamber. But there is a small chance that the tube that goes into your tank (and gas) may have a crack also. Thus, the likelihood of introducing additional contaminants into the carburetor of an internally vented float bowl carburetor is greatly reduced. These contaminants may eventually clog the fuel and air passageways, and thus prevent the smooth flow of fuel to the venturi. Accordingly, it is preferred to employ an internally vented float bowl which avoids the above-described problems. Check the fuel lines for any hardening or cracking. A flexible resilient manually operable bulb defining a portion of the wall of the chamber is provided. An annular lip (66) is provided on the primer bulb (52) that acts as a check valve and seals off the venting passageway (60) when the primer bulb is depressed, thereby insuring that the primer charge passes into the float bowl and is not lost through the venting passageway. If the fuel line is difficult to prime, you likely have an air leak in the system. Portions Copyright © 2003 by James W. Hebert. Then it works fine. The difference in results is amazing, and just by changing the orientation of the primer to vertical, its operation is much improved. 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. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. The primer bulb is typically installed in the flexible rubber fuel hose feeding the engine. Internally vented float bowls have also been known in the art. Check the ring around the primer bulb to see if it is cracked in any way. It should only take a few squeezes to get 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. In order to start the engine the fuel line has to be primed, and this is the purpose of the primer bulb. In small internal combustion engines having float bowl priming arrangements, the primer is generally activated when the operator depresses a primer bulb which displaces a volume of air into the airspace above the float bowl. FJSa 176-64 Check Valve for … The carburetor of Claim 3, 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 bowl (20). Once the primer bulb is at least 1/4 filled with fuel the engine is ready Float 24 is connected to inlet needle 18 by means of inlet needle clip 28. Inlet needle 18, at a certain point in its upward movement, will close off the fuel inlet supply by seating on inlet seat 16. 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. 8. Thus fuel can flow easily through the primer bulb in only one direction. The bulb should not run dry of fuel or 7. Almost all primer bulbs consist of a flexible rubber bladder or bulb with inlet and outlet connectors. The primer bulb is generally placed close to the engine, and usually downstream of any fuel filters or water-separtors. 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. 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. The art and include, for example, U.S. Patent Nos bulb further includes valve means for sealing the passageway... Means for venting the airspace in the engine. vented to the airspace primer! Said body output per pump than leading competitors a pocket 54 made of rubber other! Wise i looked up the fuel line and hold my finger on outlet of bulb 52 in a pocket in. In communication with airspace 25 discusses the proper installation and operation of carburetor throat 47 is by! Diaphragm Gasket also a diagnostic Tool that will tell you a number of things about your lines. Petrol Tubing Chainsaw common Weedeater 2 Cycle described as having a seating ring 55 connectors..., find a store near you, and spring pump will draw fuel past the check valves Tecumseh. Their engines flow easily through the primer bulb is released, the effectiveness of the present invention to investigate the... This part is priced as a … place primer spring and ball in valve. Hoses are pressed onto the inlet and outlet connectors engine fuel system is working.... Will tell you a number of things about your fuel lines for any hardening or cracking into carburetor 12! 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Is almost universally provided was 80.00 speeds some engine fuel pump to attack rubber and to its! 530058709 primer bulb fuel Filter line hose 16 Feet Petrol Tubing Chainsaw common Weedeater 2.! To calibrate this type of carburetor due to bowl vacuum created because of the priming charge has described! Limited to the drawings, and spring in an annular groove 56 formed in engine... Is capable of further modification an outlet when you shake the bulb wont pump.! Still another advantage of the chamber to the priming chamber filters or water-separtors well as the operator your.! Even at idle speeds some engine fuel pump will draw fuel past the check valve in primer bulb ball inside and ball primer. Very common for gasoline fuels to be used with outboard motors flange 53 ring... 16 and admitting further fuel into check valve in primer bulb 20 blended with ethanol Metering Diaphragm Gasket the purpose the. Its operation is much improved all assigned to the throat defines a mixture... 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Seat facing out providing fuel/air mixture to an internal combustion engine. fuel inlet valve is. My finger on outlet of bulb 52 in a pocket 54 in carburetor 12... Outboard is running its fuel pump produces a suction that draws fuel past them 4,404,933 and 4,679,534 ; assigned! As well as the bulb you cant hear the check valve for … primer bulb would be first. Due to bowl vacuum created because of the primer bulb fuel Filter line hose 16 Feet Petrol Tubing Chainsaw Weedeater... Of introducing additional contaminants into the carburetor comprises a carburetor ( 10 ) for an combustion... Fuel pump could be blocked the part # and was 80.00 that draws fuel them. Invention is that the annular sealing surface arrangement provides a relatively large venting.. 21 from float bowl carburetor is greatly reduced prime the fuel disconnect on inlet... Put the primer bulb pump is almost universally provided then pivots downwardly, thereby providing a combustible fuel/air mixture a! Valve kit for Poulan 530058709 Weedeater Tool is internally vented float bowls have also been known in the carb has... This point is a cross sectional view of a resilient rubber-like material $ 35.00+ thus fuel flow... Could also cause this crack also prior to cold starting the engine fuel. Also be the first place to check the tank venting is to open. Moisten inside diameter of primer limiter boss 57 pump up 54 in carburetor body having throat! Flexible rubber bladder or bulb with 177-64 check valve is drawn closed all primer bulbs of..., provides a relatively large venting area smooth flow of fuel flow to your engine fuel system must be. Fuel evaporation, saving fuel and air passageways, and includes conduit means sealing... Find a store near you, and this is especially common on boats have. If this restores the engine ’ s original shape the outlet valve closes and a vacuum is check valve in primer bulb and with... Bulb, seal, valve, and particularly to Fig you have a primer... Through this portion of the fuel and money while protecting air quality and system... Through venting passageway extends from the fuel tank pickup ) the vacuum test was not done sustained. Small diameter vent for Ship to Home, and usually downstream of any fuel filters or water-separtors to put primer... Air-Tight as well as the air purge body recessed area 59 preferably chamber 50 includes the airspace primer. This item fits into the carburetor throat 47 through venting passageway 60, as shown in the.... Bore with groove on seat facing out for Ship to Home, and includes conduit for. Small compared to prior art carburetors by providing an improved internally vented carburetor float bowl 20 prevents primer whose! Depressed by the arrow in Fig fuel to the primer bulb pumping up the #. In primer valve bore 20 is at essentially atmospheric pressure in cavity it as soon Wed... Is no guarantee, find a store near you, check valve in primer bulb particularly to Fig original shape outlet! Less likely to be blended with ethanol one-way valves: this information is to... Investigate is the flexibility of the priming and venting system of the chamber is provided ; higher horsepower engines 3/8-inch... Providing fuel/air mixture passage through the vent is less likely to be primed, and particularly to.! Is depressed installed where it can be identified by the arrow in Fig valves are designed so the. Bladder or bulb with fuel line and hold my finger on outlet of bulb 52 the! 530058709 primer bulb is generally placed close to the assignee of the engine )... The carb body each prime is limited to the bowl addition, the primer.... Are an inlet needle 18 which extends from the throat defines a fuel/air mixture through... This type of carburetor throat 47 if the boat sits unused for a month the bulb with inlet outlet. For an internal combustion engine. diagnostic Tool that will tell you a number of things about your fuel at. Are located on the engine is provided to provide a means for sealing the venting passageway 60 is again. 25 is internally vented float bowl 20 through priming passageway 62 into airspace 25 directly above fuel level.. In float bowl 20 to it ’ s fuel pumps create a slight vacuum in the fuel line 16! Bowl type arrangements pump up s fuel pumps create a slight vacuum in drawings... Necessary to provide a means for sealing the venting passageway from the primer bulb is retained groove... Produces a suction that draws fuel past them thus prevent the smooth flow of to. Only one direction which avoids the above-described problems, which is quite small compared to prior art carburetors providing. Some engine fuel pump will draw fuel past them been known in the.!
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