The question I have is when running (about 3500 rpm) my buddy notice the gas primer bulb … Fixed it the same way. 3: I have never found a difference if the primer bulb is pointed up, down or sideways. This hose feeds from the gas tank to the engine carburetor. SIM Yamaha is a USA Yamaha outboard motor and outboard motor parts dealer. But blockages don’t cure themselves. When launching the boat the next morning, the bulb is always soft. The primer bulb or priming bubble for a Weed Eater -- a brand-name string trimmer -- functions in the same way as a priming bulb on any trimmer model. $25.99 $ 25. 5/16'' 8mm Fuel Gas Line Hose Primer Bulb Pump For Yamaha Outboard Marine Boat. The Larand Marine Primer Bulb is the highest quality primer bulb on the market. Portable boat gas tanks, outboard fuel tanks and accessories let you enjoy the most of your time on … What Size Fuel Line To Use For An Outboard, 5/16″ or 3/8″? I have a 2004 Odyssey Pontoon boat with a large steel gas tank in back, feeding a Johnson 90 HP outboard. I have one problem though, ever since the service then primer bulb keeps emptying after the engine has been switched off for around 20 minutes. 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. I shook the bulb when it was off the hose and I don't hear any ball inside of it, but just passing on what I was told. i would check that first then try some differnt fuel. The primer bulb on *any* brand of outboard motor contains two one way valves. We provide fast shipping and inexpensive shipping. A small engine primer is a bulb of plastic with a hose running through it. A blocked outboard fuel line prevents fuel from getting to the motor. Still … The same goes for fuel lines. The primer bulb that was on the boat did the same thing. On outboard motors, the primer bulb is in the fuel line, between the tank and engine. I have a 2000 90hp Honda 4 Stroke engine Just had my boat engine serviced and it's running very smoothly now. In under two minutes, you could learn how to solve the problem for good! Consult your outboard owner's manual for the recommended fuel line for your engine.) To start the engine, the user presses or squeezes the primer the correct number of times and engages the starter. When the bulb goes flat just crack open the gas cap, if the bulb inflates then you have a blocked fuel tank vent line. the original setup used scissor connectors, later used grey plugs, the connections on engine would be under black panel(3 sets of wires in/out). The primer bulb is only a " manual fuel pump " ----It is used to fill the carburetors.-----That saves the battery by not having to crank for a longer time waiting for the pump on the motor to do this.----Or it saves one from getting " popeye arms " on a manual start motor.-----Put the bulb … 4: If you have am anti siphon valve on the tank throw it away, most outboard fuel pumps don't have enough suction to keep them open, and they can gum up and stick without warning. We have run a test by bypassing the fuel seperator. The engine starts is hard to start has no hole shot and sometimes stumbles. Is it normal to have to pump the bulb every time you turn the engine off for longer than 20 minutes ? It’s simple, practical, and does the job you need it to. I replaced the bulb and it will not get hard. OK WOT she starves for fuel looses power bulb goes soft/flat. Get it as soon as Tue, Jan 12. 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