Conversation Between edcmat-l1 and Dmann1

Hey edcmat, I here your the diagnostic specialist , wondering if you may lend some help, 2003 Chevy Express Van 6.0l 3500, pulled in the drive way shut it off, came back 30 min later would not start! I have 56 psi @ the rail, I have spark, but no injectors are firing, can shoot eithier in the air box will run into gone, changed ckp have not did the relearn, just found out about it? it got dark on me I have not tried shooting eithier to see if it will start again.. Checked codes before starting anything, I had no codes, will check tomorrow again? any help ? What else would make the injectores not fire other then the pcm, does not show any scurity codes for ignition ?