Justin;

I agree with Bill, just returning by way of a T fitting wont do it...you must return to the top of the tank...a simpler way to accomplish this might be to remove the fuel gauge sender, and strategically drill and add a brass fitting to which you plumb the fuel return( by way of a hole in the trunk and coming up from below (using metal line in the trunk)...its a bit Goldbergest, but at least you dont need to drain and pull the tank). Make certain you use the high pressure qualified fuel line for all applicable places...not just regular Gates line.

To prevent disasters, great care is advisable when working on a high pressure fuel sys!

Good luck,