I will try to keep this short but the story is long. My truck is a 1996 7.3, it was my Dad's work truck. My nephew bought my Dad's business and the truck went with it. My nephew let the registration exp. and stop driving the truck. He said he would start the truck every now and then until the batteries died. The truck had been sitting for a few years was I saw it again and I needed a truck to use so I asked him about using the truck. He said it just needed batteries so we put new batteries in it, No start, no fuel pressure, so put in a new lift pump, no start. I stopped working on it. A year latter my nephew called and said he needed to move the truck and did I want it. I had it towed to my place. Because I knew it had been sitting so long the first thing i did was to drop the the tanks and clean the fuel system. The truck still would not start. I checked the glow plug relay etc. No fuel was going through. Having checked all the easy stuff I had it towed to the local dealer so they could put a scanner on and check things out. They said the fuel pressure was like 40psi and said it needed a new IPR so I let them put a new one in. Still no start so they did some more checking and said that it needed a HPOP. At that point I said stop and had it towed back home. I put in a HPOP and it still would not start. So I went back to the shop mechanic. He gave me some things to do, but felt like an injector or injectors were leaking to much. I couldn't get it started with any of his ideas. About that time I got sick and couldn't work on it for a while. When I got back to work on it I just decided to rebuild all the injectors. I figured if a few were bad others would follow. So I rebuilt the injectors and installed them and did all the steps to putting in injectors. The truck still won't start. I disconnected the relay glow plug relay and used starting fluid and it runs as long as you spray starting fluid. The HPOP reservoir I filled when I did the injectors. It has stayed full but there is no oil coming out of the injector or out of the bleeder screw. All I can think of is the replace HPOP is bad or some how the bolt to the camshaft through HPOP is loose I'm not sure where to go from here. Any ideas would be greatly appreciated.