It would be smarter and cheaper just to plumb a second fuel line from the tank with its own pump. Let the stock system work as intended, you would have to change out the pcm as well when you went to a return style system, what do you think controls the fuel pump in that type of system?

Running a dedicated second line would be better because you would easily overcome the limitations of the stock fuel line in flow volume. Plus you have other added flexibility.

warmonger

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black