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Intermittent Low Fuel Pressure

in 912 / 914 Technical Questions 7 years ago

  • Re: Intermittent Low Fuel Pressure

    by » 7 years ago

    Oh sure James, Answer all the questions and make this a tough one. LOL

    I'm going to have to give this some more thought. Doses this happen to other Kitfox's like yours?

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Intermittent Low Fuel Pressure

    by » 7 years ago

    Yes I have heard of others in varying degrees. When I was posting a lot on this several years ago, it seems there were quite a few others in a variety of aircraft that chimed in with similar symptoms. I have always had a suspicion it has something to do with the pump (new style); maybe a tendency to be on the verge of cavitation at Max rpm. Maybe it can suck in a little air from the vent line under certain conditions.
      
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  • Re: Intermittent Low Fuel Pressure

    by » 7 years ago

    On the old style fuel pump that had the weep holes top and bottom, I would put a drop or two of engine oil from the dipstick on the top weep hole if the fuel pressure started to drop, and this would bring the pressure back to normal for about 10 hours. What this meant to me was that the plunger shaft was getting galled up and sticking due to a lack of lubrication. Also during a gearbox inspection and cleaning the fuel pump eccentric was damaged from pounding on the end of the pump plunger.
      
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  • Re: Intermittent Low Fuel Pressure

    by » 7 years ago

    This can also be fittings in line and even though the spec for an electric pump was 3.5 gph that at times is not enough and plumbing may be part of that issue. Very rarely do owners take into consideration that fittings and plumbing play a part in final fuel delivery.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: Intermittent Low Fuel Pressure

    by » 7 years ago

    Don't know if mine is the same issue, but I also have a KF 7 SS, 2010, erratic fuel pressure readings (2.1 to 7.2) new return fuel line, remote mount sensor and new style Kavlico (changed setting to sensor type 6), Installed new ground wire. I have the Corona fuel pump, thinking about replacing it, but it sure seams like a sensor. Engine runs fine, but the alarm is a pain. David
      
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