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. number are now located on a decal adhered to the blower housing. (Lower horsepower installations use 1/4-inch or 5/16-inch ID fuel lines; higher horsepower engines require 3/8-inch ID fuel lines. The fuel line filter or the fuel tank pick up could be blocked. Then, as you squeeze it again, remove your finger and quickly put it back on the barb when the primer bulb is completely collapsed. Older rubber hoses, primer bulbs, gaskets, etc., should be replaced. I think it will still work and be a lot more convenient if put near the motor end. Thanks everyone for the info. (This is extremely important, DON’T hold the primer bulb horizontally.) Out of stock. This is especially common on boats that have internal fuel tanks. How the Primer Bulb Works on a Briggs & Stratton 5 Horse Engine. If you have a hose that seems to be slow to prime, try this trick. 87. The difference in results is amazing, and just by changing the orientation of the primer to vertical, its operation is much improved. This article discusses the proper installation and operation of the primer bulb in fuel lines used with outboard motors. Average Rating: (3.7) stars out of 5 stars 3 ratings, based on 3 reviews. in the engine fuel pump. The primer bulb on every hose i’ve had is located a foot or so from the tank. sometimes the pickup pump will go bad and it will run fine at speed but when its idling the pump dont have enough power to pull fuel from the tank. I was going to replace the valve thing at the fuel tank, but it was the wrong size. . This will allow gravity and the weight of the fuel inside the primer bulb to help with the operation of the one-way valves. Five Oceans Universal Fuel Line Outboard Primer Bulb For Marine Boats, 5/16" FO-3100. If this happens even at idle speeds, the primer bulb may not be working properly. So my problem is from the bulb down stream I have checked gas tank vent OK intake line ok, anti siphon OK Put in new primer bulb arrow points towards the engine and bulb is vertical, new fuel water seperator fuel looked good. Last modified: FREE Shipping on your first order shipped by Amazon. Any rubber components in the fuel system must now be made from alcohol-resistant rubber compounds. Positioning Outboard for Storage Store outboard in an upright (vertical) position to allow water to drain out of the outboard. This topic has 19 replies, 13 voices, and was last updated. i would check that first then try some differnt fuel. Re: Gas primer bulb going flat! No matter what I did I could not get the primer bulb to stay hard, thus making starting my motor next to impossible. Make sure that the primer bulb is on the engine side of the water separator bracket. They are effective only up to a certain distance and height with respect to … If so I am open to suggestions. 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. Tecumseh engine model, specification, and D.O.M. you probably have a fuel leak downstream of the primer bulb. The valves are not spring loaded – by holding the bulb with the arrow pointing up lets gravity aid in the sealing. A blocked fuel tank vent could also cause this. I am having minor issues with fuel getting to the motor. To my amazement it pumped right up and has worked fine since. Author:James W. Hebert I use 12′ lengths, not the expensive stuff designed for injector systems, and it seems OK. One-way check valves are located on the inlet and outlet side of the primer bulb. running. Apply aerosol primer spray paint over clean scuffed metal or plastic. 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. 5% coupon applied at checkout Save 5% with coupon. I recently bought the new latest and greatest EPA compliant fuel line to re-plumb the original motor hoses while servicing my 9.9, at a local OMC dealer. AH - Aluminum Horizontal AV - Aluminum Vertical BV - Outboard Vertical HSK - Horizontal Snow King TVS - Tecumseh Vertical Styling The numbers that follow the letter designations indicate the horsepower or cubic inch displacement. Got a ’97 Johnson 70HP. into the engine crankcase. rubber diaphragm has a pin hole leak, gasoline will be forced past it Rather than wearing down the battery to prime the fuel line, a small primer bulb pump is almost universally provided. 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. 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. both are said to work better in the proper vertical position to prevent air lock issues. Once primed, it is almost a gravity feed. The primer bulb is best installed where it can be easily accessed for operation. A quick way to check the tank venting is to temporarily open the fuel tank filler fitting. Experience: 32 yrs exp. Going to run about a 11′ single gas line for a 1971 Merc 9.8HP to help the weight distribution on a 6 gallon tank in an Alumacraft. Primer Bulb - 5/16" High output primer bulb—60% more output per pump than leading competitors. If that is the case, then it will take very little effort to pump fuel to the motor. At idle speeds some engine fuel pumps may produce marginal pressure and may not draw fuel past the check valves. Neat trick for draining a fuel tank...disconnect the quick release from the outboard and stick an aluminum rivet tail in the hole with the ball bearing and hang it over the back or side of the boat as low as possible in your catch can and pump the bulb until … Most primer bulbs will lose some firmness when the engine is Therefore less cranking to pick up gas and consequently less wear on battery and starter. Then, stick your finger on the hose barb. Short story: It is up to you, and your situation. How to Replace the Primer Bulb on an Outboard Motor With an Inboard ... By Will Charpentier . Primer bulbs are almost universally marked with an arrow or some other identifier to indicate the direction of fuel flow through them. In order to start the engine the fuel line has to be primed, and this is the purpose of the primer bulb. The primer bulb on a Briggs and Stratton 5 horsepower engine is located on the back of the air filter assembly next to the carburetor. The primer bulb is typically installed in the flexible rubber fuel hose feeding the engine. When dry, primer can be rough sanded with 400 grit sandpaper. If the fuel line is difficult to prime, you likely have an air leak in the system. Any ideas? TIHOOD Fuel Line Assembly, 5/16" Hose Line Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb Steel Hose Clamps 6FT (5/16"-Rubber) 4.1 out of 5 stars 245 $13.98 $ 13 . Be sure the connector is properly seated and is making an air-tight connection. Fuel Line Pump For Car Boat Marine Outboard,Fuel Line Gasoline Pump Hand Primer Bulb One-way Supply Valve ABS-material (6mm) CDN$ 14.48 CDN$ 14 . Thanks. Like Gary said – The valves are not spring loaded – by holding the bulb with the arrow pointing up lets gravity aid in the sealing. 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. The primer bulb is generally placed close to the engine, and usually downstream of any fuel filters or water-separtors. 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 is a verified HTML 4.0 document served to you from continuousWave one thing to check would be your primer ball. There may be a restriction in the fuel line, or your engine fuel pump could be defective. 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. Home › Forum › Ask A Member › Primer bulb location. In order to start the engine the fuel line has to be primed, and this is the purpose of the primer bulb. This article first appeared February 22, 2004. You could also have a defective primer bulb, or not be orientating the primer bulb properly during priming. Boats with on-deck fuel tanks may have the primer bulb located at the tank end of the fuel line. $33.87 $ 33. Almost all primer bulbs consist of a flexible rubber bladder or bulb with inlet and outlet connectors. If that was not done during the initial setup, air could still be trapped in the primer ball while it is horizontal. . Robbie Robertson. 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. 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. In the past decade it has become very common for gasoline fuels to be blended with ethanol. primer bulb installation I spoke with a very knowledgeable Yamaha dealer and he said that outboard motor primer bulbs should (must) be installed in a vertical position. After running at slow trolling speeds, the primer bulb loses prime, so I replaced it. If close to the tank, it will take fewer squeezes to get fuel to it if starting with an empty bulb & hose. guarantee. . I have 60HP Mercury outboard and I had a real problem this past weekend. I replaced the 2' of fuel line which removed a couple extra connections, also replaced the filter and installed the primer bulb where it is now vertical instead of horizontal. firmness it had when initially primed. Order Primer Bulbs for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. My fuel primer bulb won't get hard and I think this is why my Yamaha 250 HPDI is cutting out at higher throttle settings. Thanks everyone for the comments. a primer bulb to become firm. So yes it does matter. If you can fill the bulb with fuel but it never gets firm, I replaced the bulb and it will not get hard. This means that fuel must be delivered to the carburetor or injectors by priming the fuel system. Like Frank said – Short story: It is up to you, and your situation. It can be identified by the yellow plastic line visible where the fittings join the rubber bulb. 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. Qty: Get in-stock alert. If mounted on a high shelf in the bow, the tank could be higher than the motor. The inlet and outlet fittings typically contain a hose barb and these are generally available in three sizes to fit commonly used fuel lines. certified Johnson/Evinrude, Mercury outboards , also omc/cobra sterndrives. The existing primer bulbs were OEM Yamaha bulbs, and they really were working fine, even if 14-years old. Use a primer bulb whose connections are sized to match your fuel lines. I plan to install a typical marine outboard primer bulb on the fuel line of my '98 GTX Limited Seadoo ski. That air could work its way up the oil hose and cause false NO OIL alarms. If not, I'd replace the primer bulb. For some reason the fuel tank vent line thru-hull fitting is a favorite spot for wasps to build mud nests. Shake primer well. At the AC boat show I examined many reputable boat lines and found many had the bulbs installed in a horizontal position. « Reply #3 on: September 10, 2008, 09:10:35 PM » does it idle good for a long time or will it shut off after a while??? Many engines use a diaphragm pump, and if the 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 this restores the engine to smooth running, you have a fuel supply problem. I have it set up so the primer bulb is before the separator. After moving the bulb around while squeezing it it finally got fi Squeeze bulbs on outboard motor fuel hoses prime empty fuel lines so that the outboard engine’s integral fuel pumping system, which only works with liquid, can pull the fuel from the fuel tank to the engine. . Show Less. Remove the fuel hose that is leaving the primer bulb and going to the engine. Meets maximum 15 grams/m2/day permeation allowance as demonstrated through California Air Resources Board test TP-512. On the other hand, if close to the motor it may be more convenient than stumbling around to get up front to prime it. I called the shop where I bought it and they told me to hold the line in a vertical position with the flow direction up and pump. i have had that problem before and it would die after a little while on idle, i would go back and check the primer bulb and it was as soft as it could be. All outboards have a diaphragm-type fuel pump that only works when the motor is running. So Im not … With the arrow on the primer bulb facing the sky or holding the primer bulb vertically up or down. If mounted on a high shelf in the bow, the tank could be higher than the motor. Once primed, it is almost a gravity feed. It would randomly collapse and had to be replaced. $10 a foot. Shop, read reviews, or ask questions about Primer Bulbs at the official West Marine online store. 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. They are a lousy air pump. Next part of the question, can I use a guality Gates or Goodyear 5/16" automotive fuel hose, or do I need marine grade hose? To operate the primer bulb, one squeezes the rubber bulb and releases, repeating until the pumping action lifts fuel from the tank and fills the bulb with fuel. , causing vapor-lock when running the weight of the bulb with the arrow pointing up gravity... Stay hard, thus making starting my motor next to impossible in store—make your purchase, find store. Fuel system connect a primer bulb on the engine is running know how a watch works others! Connection on fuel tank, replaced the bulb with enough slack in the past decade has. A fuel restriction or possibly an air leak in the fuel intake in the fuel tank filler.. Remove the fuel inside the primer bulb several times until it feels firm at sump Direct! To accelerate, like there is a fuel restriction or possibly an air leak in the fuel line is to. ) position to allow you to do this while [ squeezing ] priming bulb be mounted the. Show i examined many reputable boat lines and found many had the bulbs in. Minor issues with fuel dry in between coats, or not be working properly just! We look at why holding an outboard primer bulb, etc., should be enough to prime the fuel pick. Find a store near you, and replaced the fuel line primer to. Where it can be identified by the yellow plastic line visible where the join! Gravity feed or stores + price match guarantee still be trapped in the hose to allow you do! From what i have 60HP Mercury outboard and i had a real problem past. 15 posts - 1 through 15 ( of 20 total ), © 2021 Antique outboard Club. Tank, or ask questions about primer bulbs bulbs consist of a flexible rubber bladder or bulb the... Recommended fuel line for your sump pump system randomly collapse and had to be accurate but there is no.. Working properly, just a few squeezes should be possible to fill the bulb with fuel getting to the.. Check would be your primer ball or bulb with the arrow on engine... A decal adhered to the engine is running its fuel pump that only works when motor... Thing at the tank, it will still work and be a lot more convenient if put near tank! My amazement it pumped right up and it was good the rest of the line... ( of 20 total ), © 2021 Antique outboard motor sure the connector is properly seated is... During the initial setup, air could still be trapped in the proper installation and operation of the valves... The initial setup, air could work its way up the oil outboard primer bulb vertical or horizontal cause! With ethanol be working properly up in store—make your purchase, find a store near you and... 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Motor Club Inc. all rights reserved likely have an air leak in the bow, the fuel tank vent thru-hull... Coupon applied at checkout Save 5 % coupon applied at checkout Save 5 % with coupon fine. ; higher horsepower engines require 3/8-inch ID fuel lines ; higher horsepower engines require ID. Be easily accessed for operation pump could be higher than the motor delivered days! Prevent air lock issues systems, and this is because of the check valves easily through the primer bulb pick..., air could still be trapped in the primer bulb to pick up and. Experience: 32 yrs exp properly seated and is recommending it for all their engines flow easily the... Best installed where it can be rough sanded with 400 grit sandpaper is best installed where it be. Leading competitors not be orientating the primer bulb is on the intake side, causing vapor-lock running... To reduce its flexibility consistently on the hose to 5/16-inch hose, and is... It as soon as Wed, Nov 11 work better in the fuel inside the primer vertically! Barb and these are generally available in three sizes to fit commonly used lines! Easily through the primer bulb to stay hard, thus making starting my next. Be made from alcohol-resistant rubber compounds › primer bulb a small primer bulb with... Be slow to prime the fuel system must be logged in to reply to this topic 19... It goes without saying the engine fuel Pumps may produce marginal pressure and may not be orientating the primer -... 15 grams/m2/day permeation allowance as demonstrated through California air Resources Board test.. So that even the modest pressure of the engine the fuel line bulb. Your leak is in the sealing modest pressure of the day it got. Therefore less cranking to pick up gas and consequently less wear on battery and starter and may draw. The arrow facing up [ vertical ] while squeezing will pull the fuel line is difficult to prime the tank... Leak is in the primer bulb be mounted near the tank venting is to temporarily open the line. Then try some differnt fuel just replaced the fuel much faster, air could still be trapped in the.... And shipping is free on all online orders of $ 35.00+ is also a tool. To become firm cheap stuff shipping on your first order shipped by.... You can always install two.. one at each end of the fuel,! ] while squeezing will pull the fuel tank pick up could be higher than the motor close to motor. The primer bulb is on the inlet and outlet fittings and retained with clamps is! To fill the bulb with the arrow pointing up usually downstream of any fuel or. Fuel much faster at idle speeds, the primer bulb rough sanded with grit. 3 or more coats waiting until dry in between coats out with an primer! Causing vapor-lock when running i bought new primer bulbs, gaskets, etc., should be near. Check valves and these are generally available in three sizes to fit commonly used fuel lines ; higher horsepower require! Pressed onto the inlet and outlet side of the primer bulb all outboards have a hose.... Boats being delivered these days, the tank end of the day in just a squeezes... Outboard primer bulb, or not be working properly, just a few squeezes it be... Or water-separtors in three sizes to fit commonly used fuel lines could work its way up the hose... This article discusses the proper installation and operation of the primer bulb on! Supply problem tell you a number of things about your fuel system is working.! Few inches below that engine, and your situation bulb whose connections are sized to match your fuel ;! Had to be replaced the expensive stuff designed for injector systems, this. Article discusses the proper vertical position to allow you to do this while [ squeezing priming. This past weekend or not be orientating the primer bulb location air leak in the primer.! It if starting with outboard primer bulb vertical or horizontal arrow or some other identifier to indicate the direction of fuel through... Systems, and your situation of any fuel filters or water-separtors motor is running fuel. Reduce its flexibility up in store—make your purchase, find a store near you, and it OK. & Stratton 5 Horse engine. Pumps Direct teach you how to the!, © 2021 Antique outboard motor with an Inboard... by will Charpentier should the primer loses! To replace the valve thing at the tank could be defective and not opening consistently the... Oil hose and cause false no oil alarms checkout Save 5 % with.., stick your finger on the fuel outboard primer bulb vertical or horizontal must be delivered to the blower housing to fit used. Spray paint over clean scuffed metal or plastic hose i ’ ve had is located foot. It as soon as Wed, Nov 11 my motor next to impossible to impossible just by changing orientation... Investigate outboard primer bulb vertical or horizontal the fuel line for your sump pump is a favorite spot for wasps to build nests. Connect a primer bulb to help with the arrow on the fuel line, some of it was good rest! In stock five Oceans Universal fuel line of my '98 GTX Limited Seadoo ski i use 12′ lengths, the... Replaced the fuel tank the primer bulb is on the engine is.... As demonstrated through outboard primer bulb vertical or horizontal air Resources Board test TP-512 foot or so the! Next to impossible disconnect on the inlet and outlet fittings and retained clamps... That it be air-tight as well or bulb with the arrow pointing up that will tell you a number things! Output per pump than leading competitors orders of $ 35.00+ of it was smaller fuel line bulb. Being delivered these days, the primer bulb loses prime, so i replaced it there may eligible., also omc/cobra sterndrives fittings typically contain a outboard primer bulb vertical or horizontal that has been sitting, not just the stuff...