Late EFI Bug fuel tank question

[V73W]

I believe that the outlet is in the same location as a carbureted bug tank, I do know for a fact that the size is 7mm for the efi vs. 5mm for a carb tank. I am just cutting the stock outlet out and welding a 1/2" npt fitting then a 8an (closest to 1/2") fitting into that to run an line, I haven't settled on a loop style return back into the feed line ahead of the pump or a return all the way back into the tank.