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    Senior Member Dan L's Avatar
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    Default Fuel fitting nut torque?

    I’m in the middle of my 2018 Condition Inspection and discovered that there is some fuel seepage at a couple of my plastic fittings. I found this after opening the panel behind the fuel valve and with a flashlight seeing some blue fuel dye on the connections.

    Thinking the nut had backed off a bit, despite the Superglue applied originally, I gently tightened the nut a very small amount. By very small I mean maybe one or two degrees of rotation. Almost nothing. Much to my surprise the nut cracked and a stream of 100 LL spewed out. I quickly threw some rags around it all. Some black electrical tape wrapped around things soon had the flow staunched.

    These fittings are upstream from the valve. I turned the valve to the side causing the problem and drained 10 gallons out into empty jugs. That was a short term fix.

    For a a permanent fix I called the CC parts department and ordered some new fittings after Laceigh told me the replacements are made from a different material. Crack-proof I hope.

    So, all of this is leading up to my question; how much tightening torque are builders putting on these nuts? The Nyloseal instructions say two to two and a half turns. I suspect I had these over tightened and that was the source of the seeps. But maybe not. Any advice?

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    Last edited by Dan L; 02-05-2018 at 08:25 AM. Reason: Removal of iPad’s extra words thrown in.
    Flying Carbon Cub EX #11 since 2011

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