Quote Originally Posted by rumrumm
You should not have to use thread sealant on fuel lines if you use the appropriate fittings. But if you feel you need to use something, use the teflon liquid sealant. Tape can raise havoc with your fuel lines.
Point 1: Many of the most popular fuel pumps have NPT fittings on the inlet and outlet. If you use the appropriate fittings and don't use sealant, you will have leaks.

Point 2: Tape is like anything else, including the teflon sealant. If you use it correctly, it works. If you don't, it causes problems. Sure, a piece of tape in the line can plug things up. So can a glob of anything else. "Havoc" isn't unique to teflon tape.