Hello all,

New guy here. I just bought a 2002 F150 for some light hauling and it needs a front fuel line repair.

I can't seem to pin down if I should get a nylon to steel compression fitting with a 5/16" steel connection or a 3/8" steel connection. Napa says one thing, Advance says something else - and my Haynes confirms it is either a 5/16" or 3/8" without specifying. Google has been surprisingly unforthcoming and I bet one of you knows without looking. Please save me from buying a cheap pair of calipers.

If you can't help, thanks for looking... and if you can, thanks for helping.

 

5/16" according to Pittsburgh Digital Calipers - well 0.331 inches.