Sorry swartlkk your chart was no help. Alright here is the whole story which will hopefully shed light on the problem.
Two months ago the jimmy 2k I have would not start had it towed home, towed to the dealership, they said no fuel pump coming on replace it, I found the pump wires under the tank strap flattened out, repaired wires pump came on, good fuel pressure no start, replace PCM no start relearned pass code, no start, crank positioning sensor replace, pick up coil replace, no start, but new fuel pump no start, replace ignition switch, relearned pass code, started and ran like a top. tonight after work, no start, no fuel pump prime or coming on at start. The only thing I haven't changed is the oil pressure sending unit, if that is what you guys think then how do jump it out to prove it, may be even get the thing home and replace it, it gauge shows pressure while trying to start.
Thanks

 

Might help to reference what you were stating was no help... The no-start threads in the Tech Article area will pinpoint the problem if you follow every step, checking what is required. If you skipped steps because you either didn't have the tools or didn't know what was being asked, that isn't of "no help", it is just that you couldn't make use of it and should ask for guidance on that/those steps specifically.

Was all this work done by the dealership? What led you to replacing those components? What testing was done and what were the results. Did you ever consider that one of those replaced components could still be at fault? Your post is quite void of any meaningful diagnostic information. It looks like you took the shotgun approach to auto repair and didn't do any diagnostics. Sure fire way to waste time, money, and burn through your patience.

 

My problems began two days after I bought the jimmy, quit running and no startup. They pick the jimmy up and took it to their shop and called me two days later it was rady. I asked what had happened "All are guy did was unplug the PCM and it started right up". Three weeks later I drove it work ran great, parked it and went to work. Nine hours later it will not start, it turned over, but not run. Had towed home, Checked with a diagnostic reader, all that was present: right bank lean, left back lean. Had it towed to the dealership, of course they charged me 60.00 bucks and said the fuel pump was bad, as well as the water pump and thermostat (those two items left me puzzled as they couldn't start the jimmy). By now I am getting desperate, this is the only means of transportation we have, my son works way different hours then myself, I can get to work but bum rides home if I don't work late, if so I sleep at the shack not a great place. So with that in mind I bought a new pump from the dealer, delco brand. I the process of removing the old one I found the wires to the pump were pinch under the tank strap, the ground had cut in two. Fixed it and still no start, I replaced what sensors that hold the start out. Pcm, because of what the guy said he did, the last item was the igntion switch, it ran great, untill I drove up the bumpy road to work at 9:00 pm after a day of problems to fix it woun't start. Now the code reader gives me a fuel system open line O/L. I wanted to know if any one had jumped the pump to a key on hot wire and drove it a few miles home?I work on electric shovels as an electrician, (most guys wet their pants just getting up the ladder) So I can follow prints and instruction very well. once again any help would be greatly apprecated