Originally Posted by zildjian4life218
NA engines are around .4-.5 bsfc right? Most pumps I have seen are EFI which idk if there are any disadvantages to running that high pressure pump to the regulator then just let it run back the return. The calculator on walbro said 200 lph should be good for 400hp at .5 bsfc so even if I stepped up to a 255 lph which is a popular size I should be okay since I will have that return
200lph and 255lph at what pressure? and there is generally no problem with running an efi pump with a low pressure regulator, provided your return line is adequate.