Return line fitting

If you use a return type regulator and run the return off it, the return does not have to be smaller than the supply line, because you are using the regulator as the orifice. The return style regulator regulates both fuel pressure and return pressure. That's the best setup to use, IMO. On my rat truck I am simply going to weld in a 1/4" female pipe bung right in the top of the tank and screw in a 1/4" hose barb. The only reason I am using 1/4" return line is because I am reusing the truck's original 5/16" supply and 1/4" return lines to save money, or I would use the same size return line. Although that type fuel system is kinda fancy for a rat rod, I won't have any fuel problems.