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Message: [QUOTE="6.0 Tech, post: 1568517, member: 23001"] First off, did you monitor pressure prior to changing stuff? If pressure was low before, then there’s a truck issue, if it was good before, there is an issue with what you did. If it’s a truck issue it could be quite a few things. The filters in the tank are a definite possibility, those would be ruled out by running a suction hose directly off the suction side of the pump, eliminating the suction line also rules that out, and while uncommon, I’ve pulled my hair out over a couple of suction lines that had pin holes and had air leaks causing low pressure before, so that is another possibility. Second, (or third if you count the suction line as #2), could be the pump, done plenty of them. Third, make sure you’re getting a full 12v to the pump. As these trucks get older, wires start going to shit, relays start wearing out, grounds get corroded, etc. Fourth, injector o rings are a possibility, a cut o ring is gonna lose pressure Fifth, check the lines from the bowl to the heads. The one running to the rear of the passenger head has a tendency to get cut thru by the clamp that holds it to the plenum. Also, you could have got the o rings for the fuel lines kinda ****ed up and have some rubber blocking the line. [/QUOTE]

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