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99 F350 - Stalled then wouldn't stay running
I'm brand new to this forum (other than searches to help me with my current challenge), and a noob to Diesels in General, so thanks for your help in advance and please have patience with me.
I have a '99 F350 7.3L that usually was running like a champ. About a week ago I had a problem while driving, the truck stalled when I put my foot in it. It sputtered and spit then eventually died. After a few minutes I could restart but it wouldn't run correctly and I barely got it home. I checked and noticed that it was nearly bone dry on oil (I'll blame my wife driving it for the past few weeks). So I assumed that was the issue and went ahead and did an oil change right away.
It ran great for a couple of days then had the same sputter then stall issue. After doing a bunch of searching about what to check here's what I did:
1. Replaced the CPS as it was a commonly mentioned issue. No change the truck would take a very long time cranking, eventually start but only run for about 30 seconds and die.
2. Pulled that valve covers to check the UVC harness, both were good and had the extra clips in place to hold them.
3. Unplugged the ICP, didn't see any oil on the plug. No change the truck would take a long time to start then die after 30 seconds.
4. I started to investigate the IPR and was nervous I was going to be spending a bunch on a new IPR, however...
5. Based on a couple of posts I looked at the oil level in the HPOP and saw that it was bone dry. So I added oil directly to the pump to get it about 1/2 full. The engine fired right up and runs without issue. I ran it for about 10-15 minutes then checked the oil level in the HPOP and it was full to right below the allen screw you use to check it.
So... While I'm thrilled that adding oil to the HPOP seems to have addressed my issue, I'm really nervous that I don't actually know what caused the issue. I'm about to take a long (500 mile) trip and I don't want to be always wondering if it's going to break down at any moment.
Is it possible that when the truck ran really low on oil that there was air in the HPOP that prevented it from filling normally?
What else could have caused this?