oh, yeah. Thank you. I currently external filter, efi fuel pump, to regulator, return-less. It works, so theoretically could just leave it at that for the moment I guess? Just thought that was a dodgy set up, haha. Will still probably go down the lift pump and surge tank route. Do you know if it would work from standard fuel tank > filter > lift pump > surge tank > efi pump > regulator return to surge tank? Don't know why I find fuel delivery confusing, but I do. Thank you though.