Re: 1970 Yamaha Mariner 8 high speed issue

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July 9, 2016 at 1:18 am #39917
fisherman6
Participant

    US Member

    If there is a sufficient leak at the fuel line fitting connection at the tank that could be causing this symptom. It has to draw fuel from the tank by suction produced by the fuel pump. With a leak between the pickup tube and the fuel pump, it may be starving for fuel at high throttle settings. Sort of like trying to drink through a straw with a crack in the side above the liquid level in the glass. It would be worth fixing the leak or trying another tank.
    -Ben

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