Need help with a 7.3 crank, no start

[ihman]

Hello PSA. I've learned a ton lurking on here for the last year but i think it's time for my first post. So, I'm working on a buddies '00 PSD and have hit a troubleshooting wall. First off, the truck did get hot due to a cracked degas bottle. Not sure if it's related but that's when the trouble started. Truck cranks over strong and even with no smoke. Hooked up the scanner- ICP is at zero with IPR duty cycle at 65 percent. Checked HPOP reservoir-Empty. Not sure if it makes a difference, but the truck did sit for 9 months before i started working on it. Here's what i've done so far:

1. Filled HPOP reservoir-after cranking for about 10 seconds, icp starts rising and eventually tops off at 150 psi
2. Pulled valve covers-no visible leaks around injectors or in the valley
3. Unplugged ICP sensor- no change and scanner shows about 2k psi
4. Swapped in a known good IPR- no change
5. Jumped 12 volts and ground to IPR- no change
6. Pulled a plug out of HPO rail- rail was full and seemed like pretty good flow while cranking.
7. Rechecked HPOP reservoir- about an inch from the top (i believe that's in spec)
8. I know i'm gonna catch hell for this but, gave her a little snort of either and after stumbling a bit it started and idled relatively normally. recheck the scanner- ICP 500 ish, IPR duty cyle 12 percent. I believe both those numbers are right on the money.
9. shut the truck off and immediately hit the starter- fired right up
10. Shut truck off and wait about 30 seconds- long crank but starts
11. Shut truck off and wait 2 mins- crank, no start

I apologize for the long post. Just wanted to lay out everything i've done so far. I would greatly appreciate any help with this one because i really don't know where to go from here.

 

[Arisley]

Oil should spout out of the oil rail while cranking, that is HP oil.

 

[ihman]

Oil should spout out of the oil rail while cranking, that is HP oil.

Truth be told, but good flow doesn't mean good pressure... Update on the truck: Changed the oil yesterday and decided to see if it would start. To my surprise, after cranking about ten seconds it fired right up and idled normally. took it for a drive, low on power and black smoke on heavy acceleration. Hooked the scanner up; icp is 350 at idle and ipr duty cycle steadily rises until it maxes out at 65 percent. If i could get the rev's up in neutral the icp would rise and the duty cycle would decrease but as soon as i let it sit the icp wouldn't hold. Has to be a leak somewhere??? or is the pump actually weak? I don't have the tools to deadhead the pump so i'm hoping someone has seen this before. Again, any help would be greatly appreciated.