Hello all. I need to ask a question about all these abbreviation are. Like what is the HPOP. and where is it located along with the icp, and where is it located. Also I heard everyone talking about the oil system. I am lost about all of this stuff on a diesel engine. I know the motor oil is used to lube the engine and the fuel system from what I know is different then the oil system. I am a gasoline engine mech. and I have worked on diesel engines from 2-71's up to the v16-92 Detroit diesels. So can some one explain how this 6.0 diesel works. I am trying to help a friend out with his truck. It will spin over but will not crank no smoke coming out the tail pipe. Spray a touch of either in it and will start but die right away. So any help will be appreciated. Thanks for any help Mike.