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Thread: Leaky fuel drain valve

  1. #1

    Join Date
    Nov 2010
    Location
    CENTRAL TEXAS
    Posts
    128

    Default Leaky fuel drain valve

    My left wing tank has a leaky fuel drain valve. It is a drip once every 5 to 10 seconds. Is this a difficult fix?
    I suppose draining the tank is part of the fix and then does the valve just screw out?

  2. #2

    Default Re: Leaky fuel drain valve

    afterdraining tank,valve removes, if a curtis type, need to buy replacement, not sure on other brands
    "Progress is our most important problem"

  3. #3

    Join Date
    Nov 2010
    Location
    CENTRAL TEXAS
    Posts
    128

    Default Re: Leaky fuel drain valve

    So it just screws out?
    I found this slide show on line so it looks pretty simple. Mine is the second style that has the bar across it.
    http://www.slideshare.net/jonespub/h...ing-fuel-drain

    Thank you.
    Last edited by Theo; 04-11-2013 at 07:25 PM.

  4. #4

    Default Re: Leaky fuel drain valve

    There are replacement parts available for Curtis drains.

  5. #5

    Default Re: Leaky fuel drain valve

    Hard landings Theo? Seriously, I've never replaced a fuel drain in a Tri-Pacer but I have in other Pipers, aka, Cherokee's. Not sure if it applies here, but use caution in over tightening. If you crack the boss (I think that's what it's called) it gets a little pricey. Somebody else can probably clear that up for you.

  6. #6
    gliderman's Avatar
    Join Date
    Jan 2009
    Location
    Red Deer,AB Canada
    Posts
    653

    Default Re: Leaky fuel drain valve

    Theo
    I replaced mine recently. I grabbed a buddy and we changed them without draining the fuel. we had new ones all set up to be installed c/w fuel lube on the threads of the new ones. one of us handled the wrench while the other was ready with his thumb. as the old one came out we quickly plugged the hole with a thumb. grabbed the new one and very quickly moved the thumb while the other one guy screwed in the new one- lost less than a 1/2 pint out of each wing.
    if I was to do it again I would use a rubber glove and a rag wrapped around the wrist. I love the smell of avgas but I didn't get to a shower for a while and I stunk
    hope this helps but if you would rather drain the tanks and don't forget to wipe down the jerry cans with a damp rag- static electricity is not our friend

    hope this helps
    shane-o
    Shane

  7. #7
    59pacer's Avatar
    Join Date
    Feb 2010
    Location
    Mulgoa, Australia
    Posts
    154

    Default Re: Leaky fuel drain valve

    As I recall, Curtis no longer sell spare replacement seals, though you might find some, somewhere. Saf-air use a small O-ring seal which can be replaced. I got rid of the Curtis type and went to the Saf-air CAV-110.
    Again, have it ready, complete with fuel lube, and be quick. A helper with a thumb is enough, besides, the fuel will run down his arm! You'll lose a pint at most, but I wouldn't do the job in the hangar.

  8. #8

    Default Re: Leaky fuel drain valve

    If it is the right tank you can fly it to empty. Then there is no dripping. The left tank takes a little more coordination to get empty.

    Tim

  9. #9

    Default Re: Leaky fuel drain valve

    +1 on the safe-air drains. They use a common ms oring, easily replaceable. If you drain the tanks, you will have a good opportunity to clean and lube and inspect the fuel selector valve, if your still using the original piper selector. Takes care of the valve AD. I used safe-air cav-160 on my pacer. These are the flush ones that push up to drain.

  10. #10
    smcnutt's Avatar
    Join Date
    Dec 2007
    Location
    Indianapolis, IN
    Posts
    700

    Default Re: Leaky fuel drain valve

    We've replaced the o-rings and ended up having it leak again. Since we could buy a new valve for so little we simply replaced it after that. When we just did the o-ring we drained the tank but when we replaced the whole valve we didn't bother. As others said, didn't loose much fuel in the process.
    Light travels faster than sound.
    That's why some people appear bright until you hear them speak.

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