Aux Pump Running on Battery Question

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  • #84232

    Hi,

    I’m new here and bought a 320E. What a fun plane! I’m curious about the aux fuel pump. When I turn the battery master switch on I can hear the pump running in each main fuel tank even though the aux pump switch is centered in the off position. Is this normal?

    BTW, I read about the differences pre and post MEB88-3 at this link: http://www.atsb.gov.au/publications/recommendations/1998/r19980237.aspx

    Thanks,

    David…

    #98961

    Hi, David. IIRC, from my 320C ownership, the pumps in the tips run with the battery switch on. Just like my 310Q. They’re connected to the L & R landing light circuit breakers. Not boost pumps, but they keep the tip tank fuel where it needs to be.

    #98963

    Rich is right, they are the main transfer pumps within the tip tanks, not to the engines. The service bulletin is about the aux pumps.

    Pull the landing light breakers and they will stop.

    Andrew

    #98967

    Hi David
    Welcome to TCF. You only turn those pumps off while work is being performed on the plane and you want silence. Never fly with them off! They port fuel in the tank to the area of the tank with the fuel lines.

    Congrats on the 320E. I had one many years ago and they are great performers. If you fly them 12k and up they will scoot.

    #98969

    I make a point of pulling the landing light breaker when the master is on during maintenance. I’d recommend the same.

    #98982

    Thanks for the info!

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