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Fuel Flow sensor Install

in General Tech Discussion 7 years ago
I want to install an FT-60 fuel flow sensor on my Rotax 912ULS. My concern is caring for the beautiful hose that Rotax provided between the engine driven fuel pump and the carburetors. What is the recommended method of installing the FT-60?

  • Re: Fuel Flow sensor Install

    by » 7 years ago

    The FT60 should be in the supply hose not the out pressured hose. It should be horizontal for 6" on each side and have a fine mess filter before the FT60. Google FT60 installation instructions.

    https://static1.squarespace.com/static/5282b286e4b01dd0edf58599/t/53425f40e4b0f66e779d18ff/1396858688880/FT_60_install.pdf

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

      
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  • Re: Fuel Flow sensor Install

    by » 7 years ago

    912uls engines are now supposed to utilize a restricted flow, Fuel Return line, to purge vapors.
    You will also need a second flow meter in the Fuel Return Line to measure fuel that was not used by the engine.
    Otherwise, the measurement will be falsely high.
    More fuel circulates through the fuel lines than the engine actually uses.
    The Flow Meter will need to subtract the Return Flow from the Gross Forward flow to compute the Net Flow to the Carbs.

    This is a common configuration for the 914, 915 and the 912is. It is now Required/Highly Recommended for All 912 series engines.
    See the 912 Installation Manual Section 73-00-00, Page 3

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

    Thank you said by: Douglas W Cole
      
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  • Re: Fuel Flow sensor Install

    by » 7 years ago

    Hi Bill,

    Do as Flight Design did with there's. Put the return line in downstream of the transducer. You would only need two of these if you put the return line back upstream of the transducer.

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

      
    Report

  • Re: Fuel Flow sensor Install

    by » 7 years ago

    Roger,
    Re-read your last post.
    I think you got an "Upstream/Downstream" and a "One/Two reversed. ;)
    If you put the Transducer Downstream of the Return Line, you would only need One.

    The installation Instructions suggest installing it "Between the Engine driven pump and the Carburetor".
    The Specs quote a 100psi Working Pressure.
    They have no restrictions in placing it in the High-Pressure, Out-Flow side of the pumps.

    Jack,
    It will need to go After the Fuel Pump and the Return Line but Before it splits to the Carbs.
    And, Yes! You WIll be cutting those pretty Hoses. :ohmy:

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

    Thank you said by: Garrett Wysocki
      
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  • Re: Fuel Flow sensor Install

    by » 7 years ago

    Yes your right. Downstream of the FT60. Like on a Flight Design. The fuel goes through a fine filter then the FT60, then through the gascolator and up to the pump. Then the
    re-circulation line goes back down to the top of the gascolator which is downstream of the FT60. So all the fuel only passes through the FT60 one time. The re-circulated is is only accounted for that one time.

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

      
    Report
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