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Engine Fuel pump

in 912 / 914 Technical Questions 7 years ago
Hi, I was thinking of fitting an auxiliary fuel tank behind the seats on a rans s6 using a separate feed valve, at the moment the engine pump is fed from the high wing tanks, will the standard engine driven fuel pump be Ok as the auxiliary tank height will be slightly under the pump?

  • Re: Engine Fuel pump

    by » 7 years ago

    Hi,
    I would fit a boost pump.
    If you check out RansClan ( http://www.ransclan.com/forums/showthread.php?4964-auxiliary-fuel-tank&p=38023#post38023 )
    It will show you how I set up my S6S nosedragger.

    Andrew
      
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  • Re: Engine Fuel pump

    by » 7 years ago

    The best way is an extra electric pump.
    Yes the mechanical will pump it from that lower tank, but if the mechanical pump ever totally failed (rare) then the fuel from that tank alone could be an issue. One way to possibly use it is take off with the wing tanks then switch in flight to the lower tank. If it had an issue the wings tanks could be brought back into play with some gravity feed.
    I did a research project several years back with wing tanks and only gravity feed without the pump operating, the engine will still run just not at full throttle, but enough to fly to an airport.

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

      
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  • Re: Engine Fuel pump

    by » 7 years ago

    Hi Roger,

    I´m repeating here a question about backup fuel pump seems more appropriate.

    I´ve a FACET electric fuel pump installed in my low wing FM250 with 384h. It is in line with the main fuel pump (see foto) .

    From what I´ve read here the intallation is wrong and I´m going to put a bypass with check valve to make it correct.

    I have one question regarding the Facet pump. Is it capable of supplying the fuel volume to garanty the engine running at cruize power in case the main fuel pump stop functioning? If not with is the alternative to replace the Facet to do that?

    Regards
    E_Pump_2017-09-26.JPG (You do not have access to download this file.)
      
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  • Re: Engine Fuel pump

    by » 7 years ago

    Your electric pump can take over in case you had a total mechanical pump failure. Mechanical pumps have been known to leak, but total failures are very rare. If the mechanical pump fails it fails open.

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

    Thank you said by: Genival Pacheco
      
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  • Re: Engine Fuel pump

    by » 7 years ago

    Check the psi rating on the electric pump when you buy it. Just stay within the correct range and you should be good. Facet has several size pumps.

    Alan
      
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