I am so sick of having fuel leaks

I'd just use the teflon dope and don't put it on the first 2 threads of the fitting then the teflon won't get pushed into the pump. You got to be careful using teflon tape on these pot metal (crappy grade of aluminum) pump housings cuzz if you put to much on the fitting as you tighten the fitting into the housing the tape can generate a lot of force and actually crack the threaded hole. Ask me how I know.

Also have a look at the sealing face of the fuel line flare that mates to the NPT to flare fitting. The flaring tool will sometimes leave a tiny ridge across the sealing face and you'll never get it to seal.

Terry