how to stop a leaky fuel fitting

Is there any product on the market that I can apply to a fuel fitting to keep it from leaking? The line is under 60 psi.

i put a fuel pump on an 85 305 and the
fitting at the fuel pump leaked a little
so i wraped the threads with teflon
tape and now it doesnt leak,
but it only has to hold 8 psi i dont know
if it would be able to hold more. a roll of
teflon tape is under a dollar and its easy
to take off if it doesnt work

Which fitting leaks? What is suppose to seal it? An o-ring type fitting is typical. It is a specific size and type. Any standard 0-ring won't fit right or it won't stand up to fuel pressure. A lot of times, frequent disdurbance will blemish a seal and it looks good still, usually on filters. If it's one that hasn't been disturbed, check for a crack in the line or female part of the fitting. Also make sure it hasn't been cross threaded.