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Bloody new fuel pump

in 912 / 914 Technical Questions 12 years ago

  • Re: Bloody new fuel pump

    by » 12 years ago

    Hi Jesse, What type of fuelpressure sensor gave this fault reading ? (Einar-Arne, Norway, i have a UMA /MGL sensor)
      
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  • Re: Bloody new fuel pump

    by » 12 years ago

    Hey, It is the fuel pressure sender that Dynon recommends. Il'l have to get back to you the brand. O-30 psi. range. :)
      
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  • Re: Bloody new fuel pump

    by » 12 years ago

    It is most likely a VDO 360-043. The VDO senders have been on Rotax engines for a long time. It has been the oil pressure sender along with a fuel pressure sender. Honeywell is the new oil pressure sender.

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

      
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  • Re: Bloody new fuel pump

    by » 12 years ago

    Roger Lee

    They are talking fuel here not oil. The MGL and Dynon efis systems stipulate UMA 7 psi electronic Fuel pressure sender units. We find that these units indicate higher than the hydraulic/mechanical gauges. When our analogue gauge reads 5.8 psi, the UMA indicates 7 psi. Readings are not absolute values on the UMA driven efis. This complicates the BCD pump problem analysis.If you have a UMA driven efis you need to use a second reliable gauge to make the diagnosis.

    John Waterson
      
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  • Re: Bloody new fuel pump

    by » 12 years ago

    Okay, after lots of frustration, worry, research and testing (not by me) a few things have been discovered.
    The first item with the new fuel pump is to make sure you have a recirculating line. This is how this pump was designed. It is a must have and if you don't it wll most likely over pressure. A recirculating is the way your fuel system should be set up.
    The second item is that after many fuel pressure senders have been tested it has been found that many are .5 psi off. Many of these senders function between 0-30 psi. If you use it up around 15-30 psi then .5 psi is no big deal, but if you need it to be accurate between 2.2 -5.8 psi then it's a big deal. If your new pump is putting out a good pressure at 5.5 psi then that extra .5 psi is a problem.
    If you get a new pump you should be checking it with a mechanical gauge at 5000 rpm. You need to make sure the mechanical gauge isn't off too. So many of our frustrated events with the new pumps may not have really been an issue. You either didn't have a recirculating line or the pressure sender was off.

    This is not to imply there are never any bad pumps, but many were blamed, but weren't really the problem.

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

      
    Report
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