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Thread: fuel boost pump

  1. #1

    fuel boost pump

    With plans to head to the airport at O-dark-thirty tomorrow morning,
    destination Oshkosk, I figured I'd take the Sundowner up this evening
    for a short hop and do the 30 day VOR receiver check.

    During preflight, when I rockered the fuel boost pump switch, I heard a
    quiet "thunk" and the fuel pressure needle barely winked. Checked the
    breaker but no luck. Started the engine with no problem but the boost
    pump isn't "boosting."

    With a room reserved in Fond du Lac for the week this is a REAL
    disappointment. I assume the boost pump is a critical component. I
    phoned the local A&P and he said that the pump is likely a "remove and
    replace" item.

    The engine is a 180hp Lycoming O-360.

    Any words of wisdom, advice, or consolation are appreciated.

    Larry Perry
    '83 Sundowner N65503 @ KVSF





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  2. #2

    fuel boost pump

    Larry:



    I had the same symptoms a while back. My AP/I&A diagnosed a faulty fuel
    boost pump "breaker" switch. He explained my plane (C-23, M-1745) did not
    have a standard circuit breaker on the panel for the fuel boost pump. The
    electrical breaker for the boost pump was protected by a "breaker" switch.
    Have your AP test the boost pump breaker switch. My AP replaced the fuel
    boost pump breaker switch within an hour and I was off.



    Good luck.



    Mark

    N6997R (M-1745)











    ---------------------------------------------------------------------------

    Mark Perry

    760 Eltham Court

    Ann Arbor, MI 48103-9041



    H (737) 665-4294

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    _____

    From: musketeermail@yahoogroups.com [mailto:musketeermail@yahoogroups.com]
    On Behalf Of Larry Perry
    Sent: Sunday, July 23, 2006 7:48 PM
    To: musketeermail@yahoogroups.com
    Subject: [musketeermail] fuel boost pump



    With plans to head to the airport at O-dark-thirty tomorrow morning,
    destination Oshkosk, I figured I'd take the Sundowner up this evening
    for a short hop and do the 30 day VOR receiver check.

    During preflight, when I rockered the fuel boost pump switch, I heard a
    quiet "thunk" and the fuel pressure needle barely winked. Checked the
    breaker but no luck. Started the engine with no problem but the boost
    pump isn't "boosting."

    With a room reserved in Fond du Lac for the week this is a REAL
    disappointment. I assume the boost pump is a critical component. I
    phoned the local A&P and he said that the pump is likely a "remove and
    replace" item.

    The engine is a 180hp Lycoming O-360.

    Any words of wisdom, advice, or consolation are appreciated.

    Larry Perry
    '83 Sundowner N65503 @ KVSF





    [Non-text portions of this message have been removed]



    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

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  3. #3

    fuel boost pump

    Hi all,

    Flying without a boost pump is when you will lose your
    mechanical pump for sure. Don't ask how I know. It
    might be the stains. I'm sure glad the primer pump had
    good O rings. I'ts amazing how quickly you can learn
    to time smooth strokes to get the performance you
    need. Great backup for carb drivers.


    Dan Kirby, Sierra N9299S




    --- John Hillsman <onepunkydedo@yahoo.com> wrote:

    > Based on personal experience...
    >
    > I would not fly the airplane without the Boost
    > Pump working properly regardless of the cause.
    > Mechanical Pumps do fail. I took off out of a rural
    > airport one day last year and experienced a
    > mechanical failure. The Boost Pump kept the prop
    > spinning until I could land.
    >
    > Also, when you do your run-up, do it with the
    > Boost Pump off so that you can make sure that your
    > engine driven fuel pump is working. I did do the
    > run-up with the Boost Pump off that the day I
    > experenced the failure and the mechanical pump was
    > still in the green, but low in the green. (Always be
    > sure to turn it back on before you start your
    > takeoff roll.) At climb power, it could not supply
    > enough fuel to the engine. It was a bit of a shock
    > when I reached the appropriate altitude to shut the
    > Boost Pump off and found that I was shutting off the
    > engine as well!!! I immediately turned the Boost
    > Pump back on and the engine came back to life and
    > ran flawlessly.
    >
    > It is also a good idea to check the Boost Pump
    > alone without the engine running, prior to start up.
    >
    > Both pumps are there for a reason!!! I was really
    > glad that my Boost Pump was working properly the day
    > my engine driven pump failed.
    >
    > John Hillsman
    > 74 Sundowner - N491PD
    >
    >
    > ---------------------------------
    > Do you Yahoo!?
    > Next-gen email? Have it all with the all-new
    > Yahoo! Mail Beta.
    >
    > [Non-text portions of this message have been
    > removed]
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  4. #4

    fuel boost pump

    One thing to add--the appropriate altitude is not 400 feet as the instructor who checked me out in my first low wing airplane said. I turned one off in a Comanche, at 400 feet, at night, with four aboard. It quit, and you can imagine the laundry bill. It did restart when I turned it back on. It's probably not a good idea to turn it off on take off until you can get back to the runway.

    Carl Link
    N3666Q
    ----- Original Message -----
    From: John Hillsman
    To: musketeermail@yahoogroups.com
    Sent: Tuesday, July 25, 2006 10:11 AM
    Subject: [musketeermail] Re: fuel boost pump


    Based on personal experience...

    I would not fly the airplane without the Boost Pump working properly regardless of the cause. Mechanical Pumps do fail. I took off out of a rural airport one day last year and experienced a mechanical failure. The Boost Pump kept the prop spinning until I could land.

    Also, when you do your run-up, do it with the Boost Pump off so that you can make sure that your engine driven fuel pump is working. I did do the run-up with the Boost Pump off that the day I experenced the failure and the mechanical pump was still in the green, but low in the green. (Always be sure to turn it back on before you start your takeoff roll.) At climb power, it could not supply enough fuel to the engine. It was a bit of a shock when I reached the appropriate altitude to shut the Boost Pump off and found that I was shutting off the engine as well!!! I immediately turned the Boost Pump back on and the engine came back to life and ran flawlessly.

    It is also a good idea to check the Boost Pump alone without the engine running, prior to start up.

    Both pumps are there for a reason!!! I was really glad that my Boost Pump was working properly the day my engine driven pump failed.

    John Hillsman
    74 Sundowner - N491PD


    ---------------------------------
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    Next-gen email? Have it all with the all-new Yahoo! Mail Beta.

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  5. #5

    Boost Pump

    Yeah, 400 feet is too low. I have four fuel pumps counting both engines and I don't turn off the boost pumps until at least 1000 agl, and then I turn them off one at a time waiting half a minute between and taking a look at fuel pressure.

    Dan Jonas
    Napa Valley

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