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I'll ask again
I just told you. Sitting 2 or more hours the pressure completely drops to 0. Hit the key and it goes to 45ish. But still has hard start...however before we replaced the pump it didn't matter how many times you cycled the key to prime it, it wouldn't start. Now, if you cycle it it'll fire right up
no you did not say what pressure is with key on-engine off until now, 45 is low it should be 55-60 (key-on) in which case I would lean towards the fuel pump, in addition you stated it worked fine the first day/evening. I would monitor that KOEO fuel pressure, if it keeps coming up low then normally that indicates a bad fuel pump even if it is new.
No, you're wrong. I did say what it was reading before. But also, you're wrong on what it should be. GAS engines are 55-60. FLEX engines like mine are 48-54. Delphi pumps do not fail out of the box, trust me. I've been working in the automotive industry for 12 years and alot of that was parts stores. I've done a lot of fuel pumps. Never once have I ever seen a Delphi go bad. Delphi is better than Delco in every way for fuel systems. They are engineered better than factory. The pump is not defective already. Key on engine off at 45 is just fine, running is 50/51 which is also well within spec. I didn't have that before. I only had maybe 45psi running before. Filter is fine fpr is brand new pump is new. I don't use cheap crap on my GM vehicles. I know how picky they are. You're the only one out of many people telling me you think the pump is bad. Everyone else is saying it's probably a leaking injector. That's the only thing left. That's the MOST common cause of fuel pressure drop.
No I don't run that e85 garbage. The sensor is not bad.
