Quote Originally Posted by EagleMark View Post
Any pressure on return line directly increases pressure on feed line. Remember when you pinched your return line?
Yeah, I understand that, but if there were, say, 5 PSI due to backpressure from the return line, it doesn't seem like it would make any difference. If I'm keeping 11 PSI at idle, when the least fuel is being used at the injectors, I think I'd be okay everywhere else. In other words, if I don't go over pressure at idle I shouldn't have trouble off-idle when more fuel is being used.

But if there's more to it I'd like to know. It wouldn't be too difficult to used 3/8" line all the way back if I really needed to.