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Thread: Plastic Fuel Line Fittings

  1. #1
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    Default Plastic Fuel Line Fittings

    Carbon Cub fuel fitting is leaking when cold (Alaska)... Are these fittings sealed/glued with something when assembled? They don't feel like a normal plastic 'B' nut when you put a wrench on them. Do you have to heat them to get them to release?

  2. #2
    Administrator Pete D's Avatar
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    Default Re: Plastic Fuel Line Fittings

    All of the plastic to plastic connections of the fuel system have a dab of superglue applied after assembly to prevent them from working loose.
    Pete Dougherty
    Customer Support Manager
    Cub Crafters Inc

  3. #3
    Senior Member 40m's Avatar
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    Default Re: Plastic Fuel Line Fittings

    Interesting question, you and I can't be the only cold climate Carbon or S2 cubs. When the temp drops to 10 degrees F mine leaks at the fittings in particular at the fuel valve. I suspect dissimilar materials play a role. I was able to gently tighten several which helped but did not eliminate the leakage. I would be interested if a sealant might help and which would be best.





    Quote Originally Posted by nanook View Post
    Carbon Cub fuel fitting is leaking when cold (Alaska)... Are these fittings sealed/glued with something when assembled? They don't feel like a normal plastic 'B' nut when you put a wrench on them. Do you have to heat them to get them to release?

  4. #4
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    Default Re: Plastic Fuel Line Fittings

    Quote Originally Posted by Pete D View Post
    All of the plastic to plastic connections of the fuel system have a dab of superglue applied after assembly to prevent them from working loose.
    Okay thanks Pete D. For my next question is: what is the best way to release the dab of Superglue, so I can see if this fitting is cross-threaded?

  5. #5
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    Default Re: Plastic Fuel Line Fittings

    Quote Originally Posted by 40m View Post
    Interesting question, you and I can't be the only cold climate Carbon or S2 cubs. When the temp drops to 10 degrees F mine leaks at the fittings in particular at the fuel valve. I suspect dissimilar materials play a role. I was able to gently tighten several which helped but did not eliminate the leakage. I would be interested if a sealant might help and which would be best.
    I was wondering if this was going to bring something out of the woodpile.
    I'm looking at plastic fuel lines mated up to Aluminum fittings/lines and wondering the same as you.
    This problem arose at -20F. I'm trying to eliminate the possibility of a 'B' nut being cross-threaded during assembly.
    My next guess would be the alum/nylon fittings shrinking at different rates/amounts.

  6. #6
    Senior Member 40m's Avatar
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    Default Re: Plastic Fuel Line Fittings

    I think your next guess is the right one.
    Quote Originally Posted by nanook View Post
    I was wondering if this was going to bring something out of the woodpile.
    I'm looking at plastic fuel lines mated up to Aluminum fittings/lines and wondering the same as you.
    This problem arose at -20F. I'm trying to eliminate the possibility of a 'B' nut being cross-threaded during assembly.
    My next guess would be the alum/nylon fittings shrinking at different rates/amounts.

  7. #7
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    Default Re: Plastic Fuel Line Fittings

    Quote Originally Posted by 40m View Post
    I think your next guess is the right one.
    The 'B' nut looks crooked when you look at the threads showing. This is looking through an insp. hole with a mirror and flashlight.

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