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  1. #51
    Join Date
    Jun 2001
    Location
    Scotland
    Posts
    6,305

    Default Re: Engine won't rev

    It sounds like you may have the fuel system incorrectly configured. You seem to infer that the mechanical lift pump and electric pump are in parallel however it is more usual to have these pumps in line with each other with the electric pump nearest the fuel tank and then pumping to the mechanical lift pump. so the fuel flows through both pumps in the same line. If your return line goes back to the filter then make sure that there is no way this is also finding its way direct to the the tank via some other line as this could cause a loss of fuel boost pressure. You should either have the spill return direct to the tank or back to the engine filter inlet via a throttling nipple as on many Volvos but not both. Have you got the right lines connected to the correct fittings on the prefilter?
    Eastern Scotland and beyond.

  2. #52
    Join Date
    Dec 2002
    Location
    Gloucestershire
    Posts
    5,392

    Default Re: Engine won't rev

    The thread is becoming long (!) but #24 explains. The tanks are in the keels and the electric pump lifts to the first filter, thence to the engine lift pump and then to the on-engine filter.

    The bolt through the banjo on top of the filter was the culprit as on the Volvo you reference.
    I'd rather be naked
    www.mastaclimba.com

  3. #53
    Join Date
    Dec 2008
    Posts
    147

    Default Re: Engine won't rev

    If your prop was holding the revs down there should have been some black smoke , so I think you are still not getting full fuel out of the injector pump.The bmc 1.5 as a marine engine had a continuous rating of 30hp @3000 revs, so to get anywhere under motor the prop must allow the engine to get up to 3000rpm so your existing prop (props) seem on the big side 15 X 10 or even 14 X 10 would be suitable assuming 2-1 reduction.
    Are you getting up to 4000rpm no load yet ?
    Jim

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