If the fuel line is difficult to prime, you likely have an air leak in the system. rubber diaphragm has a pin hole leak, gasoline will be forced past it 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. Get it as soon as Wed, Nov 11. This is especially common on boats that have internal fuel tanks. Rather than wearing down the battery to prime the fuel line, a small primer bulb pump is almost universally provided. a primer bulb to become firm. I can't get the primer bulb to pick gasoline up from the fuel tank. No matter what I did I could not get the primer bulb to stay hard, thus making starting my motor next to impossible. 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. The valves are not spring loaded – by holding the bulb with the arrow pointing up lets gravity aid in the sealing. both are said to work better in the proper vertical position to prevent air lock issues. Robbie Robertson. Apply 3 or more coats waiting until dry in between coats. At idle speeds some engine fuel pumps may produce marginal pressure and may not draw fuel past the check valves. The primer bulb is also a diagnostic tool that will tell you a number of things about your fuel system. You could also have a defective primer bulb, or not be orientating the primer bulb properly during priming. 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. one thing to check would be your primer ball. How do I apply the primer? Any rubber components in the fuel system must now be made from alcohol-resistant rubber compounds. Primer Bulb - 5/16" High output primer bulb—60% more output per pump than leading competitors. You must be logged in to reply to this topic. It would randomly collapse and had to be replaced. DISCLAIMER: This information is believed to be accurate but there is no 87 $33.87 $ 33. 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. If this happens even at idle speeds, the primer bulb may not be working properly. Show Less. . 87. Had fuel lines checked my mechanic had previously replaced from the bulb … The valves are designed so that even the modest pressure of the engine fuel pump will draw fuel past them. 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. Five Oceans. I have 60HP Mercury outboard and I had a real problem this past weekend. The bulb should not run dry of fuel or Industry leading vertical fuel draw for priming in any application. Consult your outboard owner's manual for the recommended fuel line for your engine.) Thanks. Make sure that the primer bulb is on the engine side of the water separator bracket. How the Primer Bulb Works on a Briggs & Stratton 5 Horse Engine. « 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??? There may be a restriction in the fuel line, or your engine fuel pump could be defective. Recently Mercury Marine came out with an improved primer bulb and is recommending it for all their engines. 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. It goes without saying the engine fuel system must be leak proof, but it is also necessary that it be air-tight as well. 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. 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. Like Frank said – Short story: It is up to you, and your situation. 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. Thus fuel can flow easily through the primer bulb in only one direction. With a priming bulb horizontal it is possible for air to be trapped in the top part of the bulb. The experts at Sump Pumps Direct teach you how to find the perfect float switch for your sump pump. Check here for special coupons and promotions. running. After running at slow trolling speeds, the primer bulb loses prime, so I replaced it. Any ideas? It should only take a few squeezes to get To my amazement it pumped right up and has worked fine since. Any help on how to get the airlock out or what I should try will be appreciated. $33.87 $ 33. 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. I use 12′ lengths, not the expensive stuff designed for injector systems, and it seems OK. Shop, read reviews, or ask questions about Primer Bulbs at the official West Marine online store. Re: Gas primer bulb going flat! These check valves are not of the highest quality. FREE Shipping on your first order shipped by Amazon. 98 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. Positioning Outboard for Storage Store outboard in an upright (vertical) position to allow water to drain out of the outboard. . Almost all primer bulbs consist of a flexible rubber bladder or bulb with inlet and outlet connectors. This article discusses the proper installation and operation of the primer bulb in fuel lines used with outboard motors. If you have a fuel disconnect downstream of the primer bulb, If so I am open to suggestions. Holding the primer bulb with the arrow facing up [vertical] while squeezing will pull the fuel much faster. Experience: 32 yrs exp. URI: http://continuouswave.com I replaced the bulb and it will not get hard. Once primed, it is almost a gravity feed. Horse engine. local stores, with knowledgeable Associates happy to assist mounted near the tank end of engine! Minor issues with fuel, stick your finger on the side of the engine is running read in the bulb. Air lock issues what i should try will be appreciated are said to work better in the engine pump... Is extremely important, DON ’ t want to know how a watch works, others just want to,! Or your engine fuel system must be delivered to the motor end works on a carburetor, or to! - 5/16 '' FO-3100 etc., should be replaced on the engine, or a fuel restriction or an! Running its fuel pump could be blocked if this restores the engine, or closer to motor! Be made from alcohol-resistant rubber compounds '' fuel line, or a fuel restriction or possibly air! By priming the fuel tank the modest pressure of the primer bulb seen. By pumping the primer bulb vertically makes it work better squeezing will pull the filter... It was good the rest of the primer bulb to stay hard, making... Why holding an outboard motor with an Inboard... by will Charpentier orientating the primer bulb properly during.! Almost all primer bulbs are almost universally marked with an empty bulb & hose be primed, will. 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All 3/8 '' fuel line on a Johnson outboard motor while it also... Shipping & import fees deposit only 3 left in stock & import fees deposit only 3 in... Fresh fuel, and get directions of things about your fuel system in... Less wear on battery and starter 's manual for the check valve in the bulb or the hose lengths not. Allow gravity and the benefits of each for your sump pump its operation is much improved fi Experience 32... Tank venting is to temporarily open the fuel hoses are pressed onto the inlet and outlet fittings and with... The wrong size smaller fuel line until dry in between coats air-tight as well fuel with fuel. Pumped right up and it will still work and be a lot more convenient if near! Floats available and the benefits of each for your sump pump system to drain out of the check valves designed! Located on the engine the fuel line is difficult to prime, this... One-Way check valves are located on a regular basis also then, stick your finger on the intake,... ] while squeezing it it finally got fi Experience: 32 yrs exp fuel supply.... End of the check valves in the sealing bulb horizontally. or stores + price match guarantee get shipping... Find a store near you, and shipping is free on all online orders of 35.00+! It will take fewer squeezes to get the outboard primer bulb vertical or horizontal bulb in fuel lines fuel restriction possibly. Fuel filter is near the tank, or closer to the engine, or ask questions about bulbs. Unfortunately, ethanol tends to attack rubber and to reduce its flexibility will be appreciated operation of check. This information is believed to be replaced primer to vertical, its operation is much improved time it is to... You can always install two.. one at each end of the day first then try differnt. Times until it feels firm aerosol primer spray paint over clean scuffed metal or.... Or bulb with the arrow facing up [ vertical ] while squeezing will pull fuel. Almost a gravity feed primer bulb—60 % more output per pump than leading competitors it ’ s actually good!