Quote Originally Posted by Henry Rifle
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.
I agree. It normally states in the instructions that you get with such parts that sealant should be used. But with regular OEM fittings (especially brake fittings) you should not have to use any. Anytime you do it right, you should not have a problem.