10 PSI of fuel pressure
#13
I figured my lift pump must be getting weak when my truck had about 260k on it. No reason, I just got ambitious and figured I'd put a new one in. It made my truck faster through weight reduction-it lightened my wallet. Absolutely ZERO difference other than that. Not that yours can't be weak, but I'd definitely suspect the overflow valve first. A 4 hour start time points to bad hoses, as you already know. If you continue to have trouble starting it after it sits for a while, the fuel heater might be leaking air in. Where the wires go into the heater sometimes will let air in enough to cause it to lose prime. I know that the truck was out of fuel, but I figured I'd put that out there just in case you still have some trouble getting it to start sometimes.
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