FAQ Spotlight: Pipe Tape Or Pipe Dope?
Use pipe dope on tapered pipe "NPT" threads. Avoid pipe tape. Using pipe tape can shed pieces of tape that may foul internal valves in the mounting head or somewhere downstream in the fuel system.
In the case of SAE type fittings with o-rings, (SAE port shown in photo) NEVER use any pipe tape or pipe dope. SAE fittings seal by compressing an o-ring against the walls in a groove and the fitting diameter. Using any "sealing product" defeats the SAE sealing system and may cause leaks instead of avoiding them.
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