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During Take-off this morning I received a High Fuel Flow alarm from the Dynon and the reading was 12.5 gals per hour. Engine was performing ok except for the fuel flow indications. I've read a lot of forum posts recently on engine driven fuel pumps failures. Does this sound like a pump going bad? I haven't checked for leaks yet. Not sure how to proceed. Any help is appreciated. Steve
  • Re: 912 ULS High Fuel Flow

    by » 11 years ago


    Hi Steve,

    Before you jump to any conclusions I would use a mechanical gauge to double check the pressure. The pressure senders go bad many times the rate the pump does. I would bet the sender is bad, but you won't know for sure until you put a gauge on it.

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


  • Re: 912 ULS High Fuel Flow

    by » 11 years ago


    Thanks Roger for your reply. I think I will first attempt to download the data files from the D180 and then discuss with Dynon techs. I recently had them work on the unit, and maybe they changed the calibration information I had earlier entered in the Dynon. Steve

  • Re: 912 ULS High Fuel Flow

    by » 11 years ago


    Hi Steve,

    I'm out of town, but I think the K factor setting for that sensor is 68,000. Don't quote me on that unless you double check the books. My comment in the last post must have had my brain also out of town. I was thinking fuel pressure and not flow. Sorry. The fuel flow sensors usually are pretty good. Once you set the normal K factor you can make adjustments to the actual flow if need be by raising or lowwering the K factor number.

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


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