The use of ethyl alcohol in fuel requires different thread sealants used because many common sealants are commonly diluted with alcohol.

In fact one gasketing compound has instructions to use rubbing alcohol to remove it. Permatex thread sealant lists ethyl alcohol as a main ingredient. That does not build my confidence in it.

I have used Locktite Hydraulic Thead Sealant with excellent results but as its price has doubled I'm looking for a cheaper alternative.

I thought I'd found it in teflon tape, but although the tape is inert, tiny threads of it get into the fuel causing problems.

There is one called Gasola which comes in different grades, some of which resist alcohol and gasoline.

Hylomar is both gasoline and alcohol resistant but it does not resist pressure. I have seen it come squirting out of oil line fittings once they warmed up. Then the oil came squirting out.