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New fuel pump

in 912 / 914 Technical Questions 13 years ago

  • Re: New fuel pump

    by » 10 years ago

    Hej björn
    I thougt about the older fuel pump which i intend to use another 4 years. I have an X-cassed airplane and EAA has not given out any mandatory that you must replace the older pumps with the new ones. But i understand that KSAK-UL has made it mandatory.

    So my Q was do you know if there was any problems with the older pumps? And if the pumps malfunctions do they allow the fuel to go thrue anyway with help of high wings or with an extra electric fuel pump.

    Bor själv utanför Boden med eget sjöflygplan, men det är X-klassat i o m att jag har PPL cert.

    Kenneth
      
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  • Re: New fuel pump

    by » 10 years ago

    Boden aera, nice. I visit a friend in Boden 2 years ago.

    Sorry, I misunderstood you.
    I do not have much experience with the older pumps. What I do know is that they can get external fuel leaks or wrecked check valves.
    The basic design is similar to the new pump and blocking fuel flow during failure is very unlikely.

    Do you have a fuel pressure gauge mounted on the aircraft?
    It is good if you can monitor the fuel pressure during flight if you change to the new pump.
      
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  • Re: New fuel pump

    by » 10 years ago

    When the pump fails it fails open. In a high wing that usually means the engine will still run, but at reduced rpms. I did some testing last year with this. I pulled both fuel lines off the pump and joined them together and I could still get full rpm for as long as I wanted. I then removed the pump and left the lines in place on the pump. So the pump was dead, but in line. I could get about 4500 static rpm which might translate into 5000 rpm in flight which is more than enough to fly some where and land. Low wings usually have an electric back up pump, but not all high wings.

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

    Thank you said by: Kenneth Hagesten
      
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  • Re: New fuel pump

    by » 10 years ago

    Roger!
    Thanks for very interesting information about the tests.

    Björn
      
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  • Re: New fuel pump

    by » 10 years ago

    Hello,
    I wonder if you could help me with advice over fitting an auxiliary electric fuel pump. My aircraft is a UK WT9 Dynamic-low wing and not fitted with either a fuel pump or fuel pressure gauge. I note Rotax recommends fitting a back-up pump. The engine is a 912 ULS. There is a very low risk of failure of the mechanical pump (although engine is new) but in a low wing aircraft this would mean a forced landing and this concerns me!

    Can you recommend a pump to fit? I have been recommended a Facet solid state pump. Which is best electric or pressure gauge? I prefer this gauge with a sender as no fuel then coming forward into the cockpit area. Attached is a photo of my cockpit with potential siting of fuel gauge. What position would you place it in? How difficult is it to fit the gauge and sender? Where would you site a pump? Any particular views on what pump?

    Under the BMAA rules I can fit a Fuel Gauge as a standard modification now in the UK (recommended) but I need to gain prior authorisation to fit a fuel pump-hence the reason for tapping into your experience! Your comments would be most welcome-Many thanks Mike
    FuelPressureGuage.pdf (You do not have access to download this file.)
    FuelPressuresensorRO-P906-B001-0S_technical_specification.pdf (You do not have access to download this file.)
    ConnectorCableRotaxFlightLinefromAircraftSpruceEurope.pdf (You do not have access to download this file.)
    FACETSolidStateFuelPump.pdf (You do not have access to download this file.)
      
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