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No return line in fuel circuit?

in 912 / 914 Technical Questions 10 years ago

  • Re: No return line in fuel circuit?

    by » 10 years ago

    Hi Kenneth,

    The old AC and Pierberg pumps could more easily get away without using a re-circulation line, but the new Corona pumps may not be so forgiving and many have found out that due to higher pressures that some times they can have a rough running engine from too much delivered fuel and pressure. The electric fuel pump will increase the over delivered fuel pressure around .5 psi if plumbed correctly. Some have gotten away without the line and some haven't. It was designed to have the re-circulation line. This hose should be an easy and not an expensive installation. The
    re-circulation line also helps reduce the chances of vapor lock    . Installing your fuel lines in fire sleeve protects you from a fuel fed 2000 degree fire, but also helps a little in insulating the fuel lines from a little of that engine heat under normal running conditions. With cooler fuel always circulating this helps prevent fuel from becoming to hot within the lines and producing vapor. Tight cowled engines are more prone to this than an open air engine that is fully exposed to the air during flight.

    Some times we only get away with something for 15 years. doesn't mean it can't happen to us.

    As a 30 year firefighter I went to thousands of calls where something bad happened.
    Everyone of the people always said, "Well that never happened before".

    It did today.

    IF you start having problems without the re-circulation line, i.e. rough running from a fuel delivery issue you'll know pretty much where to start looking.

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

      
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  • Re: No return line in fuel circuit?

    by » 10 years ago

    Thank you Roger
    I have the old AC pump which has four years left to operate. I shall se what i will do with the return line, maybe best to install one. But the fuel pressure gauge should not be so vital, so i intend to skip that part of the system.
      
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  • Re: No return line in fuel circuit?

    by » 10 years ago

    If you will decide to fuel pressure gauge use this eletric one. Mechanical not looks good. You have to put another fuel line into your cockpit.
      
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  • Re: No return line in fuel circuit?

    by » 10 years ago

    Which do you mean Przemyslaw? You have not attached anything about that fuel pressure gauge.
      
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  • Re: No return line in fuel circuit?

    by » 10 years ago

    You can use two types of fuel gauges:

    Mechanical: http://www.faston.pl/assets/images/fotosy/wskaznik_cisnienia_paliwa.jpg

    and with electrical sender

    http://img13.allegroimg.pl/photos/oryginal/38/60/86/67/3860866785_1

    Second one is better because you don't need to put fuel line into cockpit for gauge. You installing fuel sender and go by electrical wire.
    Thank you said by: Kenneth Hagesten
      
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