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cflowers169

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Okay guys, need to pick your brains! 05 2500HD 6.0 Gas, P0300, acts like starving for gas but has good pressure, started at 1/4 tank then at 1/2 tank and now it is doing it with a full tank! Will crank and crank but will not fire, like not getting gas. When it finally runs, you have to keep your foot on the gas because if it dies it will be hours or the next day before you get it to start again. CPS was changed before the ECM died. I have replaced the ECM, truck died running down road and all electrical shut off! New plugs, new wires, replaced both knock sensors and put in replacement intake gasket. found a clogged injector and replaced it. Ran pressure test and fuel pump is great. We are stumped!

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Spec is 56-62 PSI being at 55 I would all but guarantee that is your problem

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A pound or so off can make a big difference. Did you check the replacement pumps pressure as well? Key on, engine off

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well, pump is ~58 psi with no bleed off. now dealer is saying possible tps, they supposedly replace quit a few of these. ecm harness looks good. supposedly did re-learns as well.

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