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Message: [QUOTE="Tree Trimmer, post: 429215, member: 716"] why do you need a regulator on the fuel pump? iirc, you, meaning white monster, do or did, turn the reg up on the airdog all the way to use the supply/return reg to set system pressure. im not following why, on a 6.4, you have to regulate the supply and return. if your already regulateing the return, it seems kind of redundant, to also regulate the supply. why does it matter what pump you have, to determine if you regulate just the return. im coming from a 7.3, which just requires a RR. everything between the pump and the return line, is X psi, which in our case, is about 60-65 psi. does a 6.4 require 2 different pressures? one, say like 10 psi for the supply, and 3-4 for the return or something? what is so different about a 6.4, that your fuel systems are so....funky. [/QUOTE]

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