Hello forum members,

I am looking to buy a fuel pressure sender for my newly installed MGL EMS-1 I'm using with my new 912ULS. They recommend the UMA 7 psi sender.  However, my question is whether 7 psi is enough since per the OM for the 912 it indicates that the max pressure is 7.26 psi. Ok, it's pretty close but a sensor should be somewhat higher than what you are trying to measure so what are people using out there? or is this sensor just fine?


  • Re: Fuel pressure sender recomendation

    by » 3 months ago

    Go with the MGL recommendation. Best chance of giving meaningful readings. Best chance of sensor being compatible with EMS-1.  Problems? you got, it take it up with MGL.

  • Re: Fuel pressure sender recomendation

    by » 3 months ago

    7.26 psi is the MAX pressure.
    Nominal Operating Pressures will be closer to 6 down to 5.
    The Sender outputs 0.5 to 4.5 volts for pressures from 0 to 7 psi.
    There is no reason it could not put out 5 volts at 7.8 psi.
    It is just that UMA is not going to guarantee it or that the curve will still be linear when out of the spec'd range.
    Set your Redline Alarm at 6.95 psi and it will get your attention that something is wrong,

    Fuel pressures are determined by a spring in the Fuel Pump.
    They tend to fail by getting weaker or flat-out breaking, resulting in LOW Fuel pressure.
    Even more common is the Fuel Pump Diaphragm tears and pressure drops to near Zero.
    Overly High Fuel Pressures do not tend to be a problem.

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

    Thank you said by: RotaxOwner Admin

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