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Mercury 40hp OC233028 issue

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  • Mercury 40hp OC233028 issue

    The engine runs great for 15 minutes out on the water, they power output drops to about 50%, a few mechanics have not been able to figure out why.
    Anyone have any ideas, fuel pump just rebuild, engine dynoed, carbs cleaned.

  • #2
    How well vented is your fuel tank?

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    • #3
      Originally posted by Beryl Pearl View Post
      How well vented is your fuel tank?
      I was wandering the same thing, this is on my old boat and I have not experienced it myself.
      Thanks for your input I will definitely ask him about that.

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      • #4
        Run the motor off a new/different/portable gas tank and see what happens.

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        • #5
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          I told hi to take the gas cap off when engine loses power to see what happens, new gas tank will keep in mind

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