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I doubt that overtorquing or cracking is the issue with Teflon. I would suspect that it is MUCH more likely that ordinary teflon tends to break down when exposed to petroleum products. Anytime I have to deal with a fitting that's going to have any kind of petroleum product, liquid or vapor, I need to use a thread sealant (liquid or tape) that is rated accordingly. Nothing worse than a fire because a leak generated from sealant breaking down...or winding up with the junk in your carb or injectors...

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I assumed (there's that word again!) that we were talking about the applicable Teflon sealing tape, not something you'd pick up at Home Depot. If you do a web search there are Teflon tapes formulated for fuel usage. Is it still a good idea? I don't know. I'm not a personal fan of tape. The tape gives you a false indication of how tight the fitting is. I've personally cracked fittings and some of my friends have, primarily in castings, from overtorquing the fitting. I like something like Loctite 567, a gasoline rated anaerobic sealant. But whatever floats your boat.

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