if the return line is smaller than the feed, [such as 1/4" return, 3/8" feed] does the restrictor need to be larger or smaller than .060 ?
i think it depends on the pump. Chrysler chose .060" for their high pressure pumps. seems to work, but a lower pressure pump will need less or none at all, and the modern high pressure electric is a different game. return line size such as 1/4" doesn't mean much for these mech pumps; I've done smaller. i think it really depends on how much you want to take the pressure down. from what i've done .060" didn't take something like a 9lb carter down enough for me. going too large will screw up high rpm fuel pressure; been there done that. maybe a juggling act?
