Anyone know what factory fuel pressure should be?

[MrJrod]

Hey all.

I have a 2009 GMC Yukon Denali, 6.2.

I have the fated P0171 and P0174 codes with some rough idling. I checked fuel pressure in at 60-55 priming and idling at 44 psi. I'm fairly certain the fuel pump is shot, but I cannot find the factory numbers anywhere.

I have also read in a few places that the fuel pressure reg can cause these symptoms? I can honestly say, having owned 70 cars, most higher mileage, and I have been working on them for 15 years. I have never replaced a fuel pressure regulator that was faulty. Any ideas / historical patterns with this truck. Thanks for the help!

 

[MrJrod]

So, just to answer my own question and for those seeking the same info, I found that the priming fuel pressure should be anywhere from 50-60 psi. The running Fuel pressure should be between 43-45 psi. Thanks me