high pressure oil pump problem
 

I have a truck here at shop of a friends,it was not running,someone told him it needed a new high pressure oil pump.They put one in,now it will run,but if it sits for more than a couple days it won't crank,till you fill the high pressure pump with oil.Any thoughts of what to look for? any help would be great,thanks richie

You already started this thread and I have commented on it. I'm going to lock this one