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.338 mag.

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  • Fish Witch
    replied
    Fuel Flow Problem

    Have you got built in fuel tanks? There's an anti-siphon valve on the tank outlet that can plug giving you the symptoms you describe. Don't just remove it, though, as it is a literal life saver if you ever have a leak in the fuel line that could fill your bilge with gas.

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  • 7mm
    replied
    fuel pump

    i belive that it is you fuel pump i had the same problem one weekend and ended up squezzing the ball in order to fish. its not that hard to fix. what happened is probably during the winter you either had some water and it froze inside the pump or the diafram craked because it had dryed out. that is my 2 cents
    Robert

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  • AlleninAlaska
    replied
    The bulb may be wore out.

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  • AkBillyBow
    replied
    This might sound silly, but check the direction of flow on the ball (arrow). I had a primer ball inline backwards once, and it would only run when I pumped it (like you), then it would die when that amout of fuel was burned. It could not pull fuel from the tank, as that ball is a one way check valve. It ate me up till I found it, then I felt stupid that it was so simple and I was digging so deep.

    Good luck...AkBillyBow

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  • spoiled one
    replied
    f 115 problems

    Have you checked the connections for the main wiring harness? I had a similar problem with one of my F 100's on my old hewescraft. All symptoms pointed towards fuel delivery. According to Dewey's, the yamaha wiring harnesses were not built long enough to reach from the controls to the power head so they had to spice material in. The connectors they used had corroded. John at Deweys said that dielectric grease should be added every season. Solved the problem.

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  • bkmail
    replied
    Fuel problem...or pump?

    If the motor idles fine but dies when you accelerate, especially after a few seconds, check out your fuel pump. I had an Evinrude that had a tear in the diaphram in the fuel pump that prevented it from keeping up with demand for fuel a few seconds after you gave it some throttle. However, at idle it was able to pump enough to keep it running. Just a thought...
    BK

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  • .338 mag.
    replied
    the sick motor

    I will try to switch lines and hope that is it. Thanks for the help...

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  • BrianW
    replied
    How about the quick disconnect fuel fitting where it enters the engine cowling. Are your fuel lines long enough to switch them at the engine? If the problem swaps, it's the fuel system, if the problem remains it's the engine.

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  • .338 mag.
    replied
    my sick motor

    I am running off one tank and one motor runs good. The other motor dies like it runs out of fuel. If I squeeze the ball it keeps running. Can't find a leak in the line.

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  • BR
    replied
    Are you running off one tank or two? Sounds like it could be a vent problem if it has it's own tank. Possible water in the tank if your running dual tanks also. Picks water up when it's running do to pitch and motion. Maybe a weak fuel pump although I'm thinking not. Good luck.

    BR

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  • .338 mag.
    started a topic .338 mag.

    .338 mag.

    I have two 4 stroke 115 Yamahas on my boat. They have about 350 hours on them. The port motor runs great. The starboard motor acts like it runs out of fuel. Changed the fuel filter a week ago. If I squeeze the ball the motor keeps running. Usually runs for a few minutes and then stops. A couple of times it ran for an hour or so before stopping. Traced the fuel lines and can't find a leak. Found this out on my trip to Whittier the other day. If any of you have any ideas on what could be causing this please reply. Thanks..

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