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96 Mastercraft Prostar 190, poor fuel delivery

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  • 96 Mastercraft Prostar 190, poor fuel delivery

    Boat starts and idles out fine but stumbles when trying to accelerate. You can see the cone shape of the fuel injecting in the throttle body weakens and changes shape as the throttle is opened. The cone gets smaller as you open the throttle. It's had two new fuel filters. The fuel pressure hasn't been measured. Other than that is there anything else that can be checked to disagnose the problem? Should I open the throttle body to check for debris?
    1987 Doral Classic 200 Bowrider, 4.3 Mercruiser/Alpha One, 1970 Evinrude 9.5hp Sportwin, 1965 Johnson 5hp, 1964 Evinrude Speedifour, 1963 Evinrude Starflite and 1960 Evinrude Lark and when all else fails, Upper Canada Paddle Company paddles

  • #2
    What motor is in that Mastercraft?

    Do check the fuel pressure. Looking at the spray may not mean much because the increased air as speed increases tends to flatten the cone.
    BOAT SPECS FORUM HELP STARCRAFT FORUM SHOP iboats
    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

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    • #3
      It's an Indmar 5.7
      1987 Doral Classic 200 Bowrider, 4.3 Mercruiser/Alpha One, 1970 Evinrude 9.5hp Sportwin, 1965 Johnson 5hp, 1964 Evinrude Speedifour, 1963 Evinrude Starflite and 1960 Evinrude Lark and when all else fails, Upper Canada Paddle Company paddles

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      • #4
        Sign up today
        Should I open the throttle body to check for debris?
        Ayuh,.... I'd start the diagnosis at the other end,....

        The tank's vent, the dip-tube, the anti-siphon valve, the fuel pump, then the injector,...

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