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Interesting, i got my pump used when i ran the carter pump. So nothing told me to not use teflon tape, it ran just fine for a daily driven year with the teflon tape. I still have the 'good used' carter pump in my boxes. I run teflon tape on the NPT fittings at my fuel pressure regulator, holley blue pump and fuel filter. No issues in 3 years there.



Mine said not to use it. I think the reason it that they are nptf (fuel) threads. One is straight and one is tapered so they self seal. If it's working well, dont mess with it.



I would guess that the Teflon tape "lubricates" the threads to the point that the fitting can be easily overtorqued and crack the female fitting (housing).



I doubt that overtorquing or cracking is the issue with Teflon. I would suspect that it is MUCH more likely that ordinary teflon tends to break down when exposed to petroleum products. Anytime I have to deal with a fitting that's going to have any kind of petroleum product, liquid or vapor, I need to use a thread sealant (liquid or tape) that is rated accordingly. Nothing worse than a fire because a leak generated from sealant breaking down...or winding up with the junk in your carb or injectors...

2 Demons...no, not my kids!