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Message: [QUOTE="Tiha, post: 1560743, member: 33189"] It is surprising how often you read guys putting in a CP4 and although they found shavings and needed it, it did not fix their problem. CP4 could very well be where I end up but I hate guessing and in my case I don't see any reason for it unless maybe I have had low fuel pressure for a couple years now. I am puzzled by the lack of low fuel warnings when low side is 42 psi. Thinking about it, if that has anything to do with my issue and restricting the return increases low pressure above 42psi the truck should start better correct? So maybe that is one way to troubleshoot it, by restricting the return line? Reading on the pressure control valve. Says it is open to allow fuel to flow through the rails during Key on Engine off situations, then closes during cranking. But really cannot definitively find what Low pressure PSI should be with Key on Engine off. Don't see anything about the PCV holding any type of minimum pressure, just that it closes during cranking. So that could still be my issue if it is stuck. Also I think that would be verified by restricting my fuel return line. [/QUOTE]

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