Quote:
Originally Posted by Ole Don
I have seen new fitting nuts from overseas with a line down the threads. Fuel would follow the line and leak. I looked through a bunch of them and found older fittings with no line.
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I have not seen self-tapping fittings on metal fuel lines, but even if they did have the self-tapping threads, they should still NOT leak.
The seal has nothing to do with the threads. The flare end of the metal tube is crushed against the fitting in the tank. That's the seal.
BTW, the thread used on all those metal tubing is NOT a tapered National Pipe thread. It is straight pipe thread, and does not tighten as it is turned clockwise.
If the gas tank was an old one that had been disconnected from the fuel line at a junkyard for any number of years, you could assume that the female fitting in the tank would be corroded and would not accept a good seal.
But I think he has a repro tank, so that isn't it.