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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.