you can run a surge tank: Feed a small tank with your stock pump/lines and run the HP pump off the bottom of this tank, run the return line back to the top of this tank. The fuel will just cycle through this tank and you dont have to upgrade your feed line but you will still need a return line to the supply tank unless you can rig up a float system in the surge tank inlet and a needle seat inlet valve. Benefits are there is no sump to uncover, and your high pressure fuel line is kept short, drawback is it is its in the engine bay and could be the size of a car battery once your done with it, but you were going to relocate your battery to the trunk anyway...right? :)