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Thread: Fuel Level Sensor tank (above header tank) gas leak

  1. #1
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    Default Fuel Level Sensor tank (above header tank) gas leak

    I've found a small gas leak in the fuel level sensor tank. It appears to be the bottom most connection. I think it's the fitting and not the hose (I replaced the host about 3hr engine time ago during annual). Wondering if anyone else has had this issue. Also wondering if the gasket dressing in the image attached is the right one to re-seal it? Once removed what's the best way to clean off the threads?

    20220519_200232.jpg20220519_195754.jpg
    Almost Flying Model 6
    912 IS
    Airmaster Prop
    Garmin Stack
    C-FKLO

  2. #2
    Senior Member rv9ralph's Avatar
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    Default Re: Fuel Level Sensor tank (above header tank) gas leak

    I wouldn't use that. If you are talking about the threaded connection, I recommend PFTE thread sealant, ensure that you use one that is not affected by petroleum products.

    Permatex does have that product.
    Ralph
    Kitfox 3 flying
    Building Kitfox SS7 (RockFox)
    915iS Engine
    Building Partner Victor V

  3. #3
    Senior Member Eric Page's Avatar
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    Default Re: Fuel Level Sensor tank (above header tank) gas leak

    Interesting... When I asked much the same question about fittings in my header tank, I was advised to use exactly that product. I have since become aware of a product called Gasoila that contains PTFE. I'd be interested to hear others' recommendations on this topic.
    Eric Page
    Building Kitfox 5 Safari
    Member: EAA Lifetime, AOPA, ALPA
    ATP: MEL | Comm: SEL, Glider | ATCS: CTO
    Map of Landings

  4. #4
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    Default Re: Fuel Level Sensor tank (above header tank) gas leak

    This is the stuff I've used, and it works good. Even good on an old plastic header tank. JImChuk

  5. #5
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    Default Re: Fuel Level Sensor tank (above header tank) gas leak

    Quote Originally Posted by rv9ralph View Post
    I wouldn't use that. If you are talking about the threaded connection, I recommend PFTE thread sealant, ensure that you use one that is not affected by petroleum products.

    Permatex does have that product.
    This is what's on there now and didn't seem to work. Or maybe I just applied it badly. Probably the latter since all other areas are fine.
    Almost Flying Model 6
    912 IS
    Airmaster Prop
    Garmin Stack
    C-FKLO

  6. #6
    Senior Member 109JB's Avatar
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    Default Re: Fuel Level Sensor tank (above header tank) gas leak

    I use loctite 567 thread sealant.

  7. #7
    Senior Member Dave S's Avatar
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    Default Re: Fuel Level Sensor tank (above header tank) gas leak

    Good morning,

    The builder's manual for our S7 recommended Permatex 9AR for fuel fittings (tanks, header, etc), which most recently has been sold as Permatex 80938 (both called "Tack and Seal).

    It is a white, non hardening compound. All of the fittings I used this on from the start have remained leakproof; and, if necessary to unscrew them, it is still somewhat soft (non hardening) and easy to take apart.

    I think Aircraft Spruce still finds it on a search for "9AR", although I have purchased it at my local auto parts store.
    Dave S
    Kitfox 7 Trigear (Flying since 2009)
    912ULS Warp Drive

    St Paul, MN

  8. #8
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    Default Re: Fuel Level Sensor tank (above header tank) gas leak

    I found the 9AR to be unobtainable. Contacted Kitfox who sold me that 85420 stuff
    Kitfox 5 (under construction)
    Citabria (sold)
    Commercial SE/ME, CFII

  9. #9
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    Default Re: Fuel Level Sensor tank (above header tank) gas leak

    Permatex Tack and Seal works great, in the end there's a lot of sealants that work well

    This works well for threaded fittings:

    EZ Turn Lubricant | Aircraft Spruce

    Jeff

  10. #10
    Senior Member bbs428's Avatar
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    Default Re: Fuel Level Sensor tank (above header tank) gas leak

    Agreed - EZ turn is good stuff.
    Somebody said that carrier pilots were the best in the world, and they must be or there wouldn't be any of them left alive. Ernie Pyle

    Brett Butler
    Building: 1998 Model 5 Outback, 912ul 110hp, G3x and 7 mods

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