Well in my quest to put a 460 fi in my truck I got a 1993 f150 19 gallon rear tank and it fits perfect in mine. I'm going to run new fuel lines but need to know what size for both the feed and return. Kinda stumped?

 

3/8 is fine for both. could probably get away with 5/16's especially for return depending on how much fuel you are flowing. depends on what fuel pump you go with and how much hp you are making. if you have a huge pump and a stock motor you won't want to skimp on the return. Since it comes in a coil I'd stick with 3/8 for both. Aluminum is easy to work with, easy to bead, and never rusts. use these to bead it at the ends: Earl's EZ-Beader - JEGS