A mechanic of a friend replaced a leaky O-ring on the HPO line that goes into the head. Now the van won't start, I was called to check over his work took it a part and found he had used silicone to gasket back the HPOP, I cleaned most of it and put everything back together. Replaced the old oil, and I checked the level in the HPOP and is good, it's buzzing while I wait to start so I assume is getting diesel up to the rail, replaced 1 battery cause it was bad but the other one charged up to 13.2V so they're both good. What can the problem be?

 

Which engine is it.....7.3 or 6.0?

 

It's the 7.3

 

Okay.....I've moved your thread to the 1999 - 2003 7.3L Powerstroke Diesel forum.