Probably a Dumb Question - O-Rings for AN fittings on Aeromotive Fuel Filter?

[gbranham]

I'm not happy with my bullet-style Summit fuel filter, so I've purchased an Aeromotive canister style fuel filter (12317). I've also purchased some -6AN to 3/8NPT fittings for it, so I can hook it up to my PTFE braided stainless fuel line that is already fitted with -6AN fittings. Neither the Aeromotive filter nor the fittings I purchased come with nitrile fuel-resistant o-rings. I assume I need them, or do the 3/8NPT threads not seal the connection in the fuel filter lid, sort of like brake line fittings, where the double flare seals it, and not the threads?

Thanks,

Greg

[BRRT]

NPT threads are tapered. As you tighten them down the taper on the male side tightens into the taper on the female side.
There is still a small gap that runs around the crest of the thread that will leak, so you use teflon thread sealer ("pipe dope") on NPT threads.
The Permatex brand works well https://www.summitracing.com/parts/p...-fluids-sealer
Be neat about the application. Keep it off the first thread or 2 of the male fitting. You wont need to apply it all the way to the shoulder of the fitting.

[Jeff Kleiner]

What Jeff said^^^

Jeff

[gbranham]

Asked and answered. Perfect. Thanks, gents!

[Avalanche325]

What? No spray foam? Oh yeah, that is for frame repairs from what I see on Just Rolled In on YouTube.