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  1. #1
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    Evinrude V4 140hp fuelpressure ?

    Hi,<O</O
    What is the required fuelpressure on a stock early 90ís Evinrude V4 looper 140hp ?


    What happens if fuelpressure is too low ?<O</O
    What happens if fuelpressure is too high ?
    <O</O
    <O</O
    Thanks,<O</O
    T.

  2. #2
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    anyone ?
    This should be easy questions but my service manual doesn't mention a exact value for pressure nor flow.
    Basic element in my fuelsupply setup is the external Holley fuelpump. I see this is a rotative volumetric vane pump. As these Marine Holley's come in a few varyties I'd like to check if the previous owner did a good job selecting the correct one.

    Therefore my questions, what happens if fuelpressure is too low/too high ? And what is the safe way to go ?
    My guess is that low fuelpressure could cause powerhead damage as there is not enough lubrification ??

    Any reply is welcome. Thx, T.

  3. #3
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    from what I remember, 6 - 7 psi, low pressure will starve the motor/ lean it out. too much pressure will not let the needles seat and flood the motor.
    "One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .

  4. #4
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    thanks ! What does "lean it out" mean exactly ? English is not my native language...

  5. #5
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    lean out = not enough fuel resulting in a melted piston
    "One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .

  6. #6
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    Auwch !

    So I can settle for a Holley red fuelpump 67gph @ 5psi without regulator ?
    http://www.holley.com/HolleyCatalog/...pageNumber=135

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