Fuel Pump Fittings....Which Thread Sealant?

[Corvette64]

Aren't you supposed to use flare fittings on a fuel pump? You didn't say what motor you're runnning, or mechanical or electric pump, so I'm assuming we're talking mechanical. My chevy's have always been setup with a factory hose fitting on the fuel pump for supply from the tank and a flare fitting on 3/8" mild steel hard line to the top of the engine. I never run a soft gas line up the front of my cars. If I'm off base here just ignore.

[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.

[Itoldyouso]

I like the liquid teflon tape. It comes in a little tube like toothpaste, but smaller, and won't break off and get in the fuel system if you keep it back a thread or two.


Don

[C9x]

I like the liquid teflon tape. It comes in a little tube like toothpaste, but smaller, and won't break off and get in the fuel system if you keep it back a thread or two.


Don

Loctite's LPT I think it's called, works fine on steel and brass.

Don't use it on aluminum.
It glues the aluminum together so strongly that you'll peel threads off the male fitting when taking them apart later on.
And later on can be ten minutes to several months.

Use Teflon tape as recommended.
It works well and the recommendations not to use it probably come from sloppy workers.
If you're careful you won't have a problem.

That said, the local speed shop recommended Never-Seize for use on pipe threads that are aluminum on both sides.
It works well.

Just don't crank it up so tight that you split a fitting.
With Never-Seize and Teflon tape, friction is lessened and it's easy to overtorque fittings.

[Henry Rifle]

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.

[rumrumm]

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.