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Electric fuel pump installation

in General Tech Discussion 13 years ago
Hello, I am going to install a Facet electric fuel pump in my airplane, it uses a Rotax 912, with Pierburg mechanical pump. Can you give me your opinion about the two systems attached ? Is possible to install it without one way check valve ? What's happen normally when a Pierburg mechanical pump is damaged, it blocks the fuel ?

Ricardo Urio
912FuelSystemparallelwithoutOWV2filters.jpg (You do not have access to download this file.)
912FuelSystemparallelwithoutOWV3filters.jpg (You do not have access to download this file.)

  • Re: Electric fuel pump installation

    by » 13 years ago

    Hi Ricardo,

    When the mechanical pumps fail they fail open. They do not block any fuel. Set up your electric pump in parallel and not series. There is no data that supports always running both pumps all the time, matter of fact just the opposite. There's no use in being paranoid. Depending on the installation it has caused carb flooding and high pressure, fuel spilling out of the carbs and rough running. That's typically old school teachings from the GA crowd. If the mechanical pump ever did start to fail you will have more than enough time to flip a switch. It isn't like an electrical failure. Your engine doesn't shut down that very second. The majority of the Rotax owners don't have dual pumps and they have been doing fine for over 20 years. Nothing wrong with a back up pump, but no need to run them all the time.

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

      
    Report

  • Re: Electric fuel pump installation

    by » 13 years ago

    Hi Roger, Is not my intention to use both at same time, but to use the electrical one as backup, as you said. What do you think about my diagrams ? Can I use without one way valves ?

    Ricardo Urio
      
    Report

  • Re: Electric fuel pump installation

    by » 13 years ago

    Hi Ricardo,

    If you put it in parallel then it will need a check valve.

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

      
    Report

  • Re: Electric fuel pump installation

    by » 13 years ago

    Ok Roger, then I will use the attached diagram.

    Thanks

    Ricardo Urio
    912FuelSystemparallelwithOWV2filters.jpg (You do not have access to download this file.)
      
    Report

  • Re: Electric fuel pump installation

    by » 13 years ago

    If you check the Rotax 912 Manual, they recomend to intall a Electric Fuel Pump. Also they show you a schematic how to do it.

    Thats is the way I have it on my Rans S12-XL with Rotax 912

    I recomend you to follow what Rotax say.

    Also, make sure you use a Fuel Return Line to the main tank as Rotax recomend.
    ROTAXFuelLines.JPG (You do not have access to download this file.)
    Thank you said by: Ricardo Urio
      
    Report
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