?adding Return Line To Under Seat Tank? V6

This is exactly what I did. I bent the hardline and it exits through the existing hole between seats to the rear (return line). I then ran it along the frame to the fuel pump. Hard line or soft doesn't seem to matter for the return line. I also used a single piece of hardline from the tank to mechanical pump (supply line) with a small piece of rubber line just before the pump and fuel filter after the pump and a fuel pressure regulator and pressure gauge just before the carb. Keep line away from heat as much as possible (supply line). Insulate as it crosses over the engine. My jeep never ran correctly before I did these mods.