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Thread: Fuel Pressure

  1. #1

    Fuel Pressure

    Hi Folks

    We are experiencing an issue with our Fuel Pressure on our BE19-A23-19
    Musky. This is a problem taht started occurring apparantly after we
    fixed up all the baffles to fix a high CHT problem as well as changing
    out some fuel lines.

    After take-off and climb out, the Fuel pump is switched off. This
    results in a drop from 5-6 psi down to 1 psi, sometimes causing the
    engine to cough. After a few seconds, Fuel pressure is restored and it
    runs fine on the mechanical pump.

    We have checked the tank vents, caps, etc in case a vacum was causing
    the problem. We have also checked all the fuel lines for
    obstructions/restrictions.

    There is no fresh air hose on the mechanical fuel pump shroud

    The only issue i am aware we may have that could be slightly related is
    an apparant cross feed between the tanks at the fuel selector valve,
    despite having replaced the orings.

    Has anyone experienced anything similar or are there any suggestions as
    to where we should look next?

    Many thanks in advance

    Mark
    Philippines




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  2. #2

    Fuel Pressure

    >We are experiencing an issue with our Fuel Pressure on our BE19-A23-19
    >Musky. This is a problem taht started occurring apparantly after we
    >fixed up all the baffles to fix a high CHT problem as well as changing
    >out some fuel lines.
    >
    >After take-off and climb out, the Fuel pump is switched off. This
    >results in a drop from 5-6 psi down to 1 psi, sometimes causing the
    >engine to cough. After a few seconds, Fuel pressure is restored and it
    >runs fine on the mechanical pump.

    Lycoming requires between 8.0 psi and 0.5 psi fuel pressure for the engine
    to run properly. So "1 psi" would be acceptable.

    However if things have CHANGED, then I'd be inspecting the mechanical fuel
    pump. They don't last forever, and I've seen several in the last couple
    years with corrosion in the check valves. Somehow water is making it past
    the sumps and the gascolator.

    >We have checked the tank vents, caps, etc in case a vacum was causing
    >the problem. We have also checked all the fuel lines for
    >obstructions/restrictions.

    If there was a cap/vent problem, you'd see the wing skin deform before the
    engine started to run poorly. The mechanical pump can evacuate the fuel
    against several inches of vacuum. I've seen a couple planes land with
    CRUSHED fuel tanks from the pressure differential. Seems unlikely that is
    the source of your problem.

    >There is no fresh air hose on the mechanical fuel pump shroud

    That would be an issue for vapor lock in hot weather, but should not be an
    issue now in the Fall temperatures.

    >The only issue i am aware we may have that could be slightly related is
    >an apparant cross feed between the tanks at the fuel selector valve,
    >despite having replaced the orings.

    The engine could suck air if you have a leaky valve. Maybe around the
    selector shaft?

    Bob Steward, A&P IA
    Birmingham, AL


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