Pipe dope or Teflon tape on fuel fittings?

Guys, I didnt know if this very basic question should go here or the fuel delivery section. I figured this is more a general question, so here would be okay.
Im installing a new regulator and was wondering if teflon tape or rectorseal is a correct sealant choice. I have the "Earls" blue 3/8 NPT fittings. The regulator is right off the mech pump if it matters.
Also, Goo gone to clean up the old sealant? Brake cleaner?

Thanks!