Went to PepBoys and bought some 3/8" and 5/16" brake lines and the brass couplers to make my main and return fuel lines for my Camaro swap. After crawling up under the wrecked Donor and hacking the fuel lines about a foot from the end (engine side) I noticed that the stock return line is TINY! What is this thing, 1/4"?!? What happens if I get the adapters and use the 5/16" lines in place? I'm still going to use a 3/8" main with a stock style fuel filter and an adj. FP regulator w/ a Walbro 340. Another question, do I still need to use the couplers when connecting the return line (So it's all hard line) or can I use some sections of F.I. hose to connect them? TIA