I am doing a little rehab on my 91 firebird. the fuel lines and brake lines have rusted through. I just finished redoing all the brakes. and I need to get fuel lines. I ordered my brake lines through inlinetube.com and was very satisfied. I want to order fuel lines, main supply and return maybe evap. but they offer two sizes. 3/8" and 5/16" just wondering if I have a 205 TBI what should I stick with? and has anyone used their products for fuel lines?

you have 2 lines on the vehicle; 3/8" is the feed line, 5/16" is the return. both would be required to do it the right way