roosterdiesel
Earl needs B100
What I did notice while cranking it the oil pressure needle never moved. One dealership thought it could be the base oil pump but another one said they never go bad.
When I replaced my HPOP line and messed up a fitting it blew the line back out. I didn't notice the oil on the ground since it was dark. The needle moved after the reservoir was filled but it still wouldn't fire since one line wasn't connected. The gauge on a 7.3L is an on/off switch...6psi in the reservoir and the needle comes up.
Low pressure oil pumps do fail but not like yours. You may have a cracked pickup tube or the the tube broke completely which has happened before. If that's the case you will have to pull the engine.