fbpx

 

Roger or others,
Today I am pretty sure I got a half tank of fuel contaminated with Jet A. I put 14 gallons of this fuel into my tanks that already had 12 gallons of good 100LL. I was on my way home from a trip and after pumping in the fuel (self-serve) I noticed it didn't smell quite right-not bad but just not quite right. I fired up for T/O and it seemed to taxi fine. But the T/O roll was longer than usual and just felt like it only had about 75% power. It climbed but just not its usual self and it felt anemic all the rest of the way home-about 2.5 hours. The engine sounded OK and didn't miss a beat, but like I said about 75% of normal power. Its a 912ULS engine. Does this sound like Jet A contaminated fuel to you?

My main question is: What steps should I take to clean out this bad fuel? I plan to drain all the tanks, but what else should I do?
  • Re: Cleaning Out Contaminated Fuel

    by » 8 years ago


    Hi James,

    If you think yo have bad fuel just drain it and replace it. Then you could drain the gascolator and then dump the carb bowls.

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


  • Re: Cleaning Out Contaminated Fuel

    by » 8 years ago


    Is there anything else you can think of, besides bad fuel, that could cause a reduction in power (20-25% reduction). The engine still ran smooth and steady with no increase in vibration for 2.5 hours, just a lack of normal power. All engine instruments read normal, just rpm was lower for the amount of throttle and fuel flow rate (I have a fuel totalizer).

  • Re: Cleaning Out Contaminated Fuel

    by » 8 years ago


    You haven't any evidence of bad fuel. Just an unsubstantiated guess.

    Before draining a tank of perfectly good fuel on a whim ...
    Drain a Quart/Liter size sample of fuel.
    The color will be off if you have Jet-A (Amber/Clear) Mixed with 100LL(Blue).

    You give no details of the flight other than an apparent loss of power.
    What you describe also sounds like high Density Altitude.

    A 2.5 hour flight home means you are again at half a tank or less.
    Take another flight around the pattern for reference.
    Land, Fill the tank with fresh gas, Repeat!
    If it runs better, The Gas is suspect.
    If it runs the same, then it is not the gas at issue.

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


  • Re: Cleaning Out Contaminated Fuel

    by » 8 years ago


    When I said contaminated fuel I didn't mean the fuel itself was bad, but you may have debris in the Banjo fittings or in the carb bowls.

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


  • Re: Cleaning Out Contaminated Fuel

    by » 8 years ago


    Bill, there are no other details to give other than a definite reduction of power immediately after T/O and all the way home for 2.5 hours. I did think about high density altitude, but prior to fueling I had been flying for 2 hours at the same or higher density altitude, climbing and sightseeing thru the Steens Mountain canyons and ridges with the engine performing beautifully. Will do as you suggest.

    If its not bad fuel, what else could it be? Will also do as Roger suggests, plus clean the air filters.

You do not have permissions to reply to this topic.