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Power Loss RV12 912ULS

in General Tech Discussion 7 years ago

  • Re: Power Loss RV12 912ULS

    by » 7 years ago

    It didn't have to be vapor lock. What makes you think that and what evidence points that way? Without some type of major smoking gun here it may not have been. I would pull the carb bowls just to check and be sure. What was the fuel pressure? Do you have a fuel re-circulation line in place? Does your plane have an electric pump and was it on?

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

      
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  • Re: Power Loss RV12 912ULS

    by » 7 years ago

    Hello Roger,
    The fuel pressure is normally around 4psi,there is fuel recirculation and no electric pump. I did not notice what was the fuel pressure being busy landing the plane that just left ground. We drained the gascolator right after taxiing back to the ramp and got uneven flow of gas and air. Prior to all of this, the motor quit once after start up when I throttled back to idle.
      
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  • Re: Power Loss RV12 912ULS

    by » 7 years ago

    Had the engine been sitting after a flight and become heat soaked or was it cool/cold?

    What fuel pump is on your plane and how old is it?

    If the engine was heat soaked vapor lock could have happened. Are all your fuel lines in fire sleeve?

    If the engine is heated soaked and you start up and notice a low fuel pressure usually either a long taxi or running the engine up at some higher rpms for a couple of minutes will usually bring in some cooler fuel. If there was a vapor lock present that usually shows up prior to takeoff.

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

      
    Report

  • Re: Power Loss RV12 912ULS

    by » 7 years ago

    The engine had been sitting about 45 minutes.
    The fuel pump is mechanical, engine is 3 year old with only 100Hrs on it.
    Fuel lines are in fire sleeve

    And you are right, need to get a good flow of fuel and air on run-up
      
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  • Re: Power Loss RV12 912ULS

    by » 7 years ago

    Sounds like vapor, but it usually doesn't shut the engine down. If it was vapor lock the fuel pressure indication should have been low. If you do have low pressure after the engine heat soaks then I would sit someplace for a few minutes and run the rpm to around 3500 and get some cooler fuel in the hose.

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

    Thank you said by: Most Fun
      
    Report
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