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1990 250hp yamaha 2stroke fuel / pump trouble shooting help please

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  • 1990 250hp yamaha 2stroke fuel / pump trouble shooting help please


  • #2
    Re: 1990 250hp yamaha 2stroke fuel / pump trouble shooting help please

    Well my motor doesn't have an electric fuel pump, but had recently faced similar issues with air leaks and bad fuel.

    Here's what I would do:
    1. Isolate that the fuel delivery is on the motor side by hooking up to an external tank (with fresh fuel!!!).
    2. If problem is motor side, get a pressure/vacuum gauge and rig it up after the primer bulb. There is a good tutorial on testing the fuel system somewhere around here. Try the FAQ section.
    3. I would definitely add zip ties.
    4. How would oil injection be relevant? To test, prevent the reservoir from refilling automatically. Put a mark on that tank and run it for a little bit. See if the oil level decreases.

    HTH

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    • #3
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      The answer turned out I needed a much larger battery, Napa with 1000cca was all it took. (I was using 750cca)

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