Fixed it the same way. Outboard Motors > Topic: Gas primer bulb going flat! A primer bulb that's lost its suppleness doesn't respond as a new one does. Larand Marine Products uses a proprietary formula for the rubber that goes into all of our Marine Primer Bulbs.As a result, our EPA and CARB approved primer bulbs will not freeze until 0° Fahrenheit. 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. Anything above that has to be a 3/8â³ fuel line. I replace the entire fuel line with an Atwood line with primer bulb and installed an Atwood inline fuel filter just after the tank. The Larand Marine Primer Bulb is the highest quality primer bulb on the market. one thing to check would be your primer ball. 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 ⦠I replaced the bulb and it will not get hard. What Size Fuel Line To Use For An Outboard, 5/16â³ or 3/8â³? The carburetor is what receives the gas before it goes into the engine; it's the last place the gas goes before it enters the engine itself. Usually the night before I go fishing, I pump the primer bulb up while preparing the boat. When you squeeze the bulb, the inlet valve closes and the outlet valve opens forcing the gas that's in the bulb to be pushed towards the engine (there's Sunnyglade 6FT Fuel Line Assembly 3/8" 5/16" Hose Line Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb Steel Hose Clamps. 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. SIM Yamaha carries Yamaha OEM discounted engine parts and Yamaha maintenance parts and accessories for Yamaha outboard motors. 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. We have blown out the pickup. Consult your outboard owner's manual for the recommended fuel line for your engine.) The primer bulb that was on the boat did the same thing. 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 on small engines is a small plastic piece that, when pressed down, draws fuel from the fuel reservoir and into the carburetor. 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. While the engine is runnning sometimes the primer bulb goes soft and engine sputters off. I have not experienced a "soft" bulb all during the winter months when I've been out. The same goes for fuel lines. 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. In under two minutes, you could learn how to solve the problem for good! We provide fast shipping and inexpensive shipping. 5/16â³ fuel line can be used in up to a 115 HP outboard engine. SIM Yamaha also sells Yamaha outboards at discounted prices. These additives are inexpensive ways to take care of your outboardâs fuel system over the life of the motor. I love the boat and just took it back to the dealer for the 20 hr service. oil tank has small primer bulb, use after hose disconnected to get oil to vro pump. The primer bulb creates the initial flow of fuel between the inboard, built-in fuel tank and the carburetor, in low-pressure, carbureted outboard motors, or between the fuel tank and the vapor separation tank -- and the electric fuel pump -- on electronically fuel-injected motors. 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. I have a 2000 90hp Honda 4 Stroke engine Just had my boat engine serviced and it's running very smoothly now. Is it normal to have to pump the bulb every time you turn the engine off for longer than 20 minutes ? A blocked outboard fuel line prevents fuel from getting to the motor. On many small engines, this involves pulling the starter rope, although some small engines have an electric starter. 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