Hi this is my first diesel I got this truck about a year ago and was told that it had water in the tank somebody stole the batteries and the catalytic converter I put batteries in it drain the tank and filled it with fresh fuel and it fired right off ran great for about 2 months then I was sitting at idle it just started running real rough and dies it was hard to restart but I did get it started and I drove it about a half a block to a friend's house and parked it there for about 3 months. After some research I decided it was probably the fuel pump so after replacing the fuel pump it ran great for about 15 miles and it started the same s*** I was told by a mechanic it was probably that I put a bad fuel pump in it so since the fuel pump I put in had a lifetime warranty I decide to replace it again now it's running rough and I have all these codes and I don't know where to start. It's throwing a p0267 a p1271 p1272 and a p1273 a p0220 p1780 p0703 p0476 p0603 is there one thing that could cause all these codes? Any help would be greatly appreciated.

To help us help you and reduce the clutter....

What year, any mods, miles, any history on new parts or maintenance?

Did you check the oil level?

Did you check the fuel filter?

Have you checked battery volts/condition? new batteries and sitting for a few months sounds like the truck was jump started? A weak battery(ies) can make a truck run beyond funky so its good to put them on a charger will your diagnosing this and cranking the truck up to test etc.

First thing I would have done is replace the CPS since that causes weird stuff to happen.

Check fuel pressure on the fuel bowl at the shrader valve.

You most likely have air in the fuel lines. Start it and let it warm up a little then give it a few revs and drive it like you still it.

Make sure oil and coolant are good. It's tough to hurt these motors and overheating it is one easy way. So don't be afraid to be hard on it to get the air out.

She is a 96 crew cab with an 8 foot bed single wheel axle 2 wheel drive no mods that I know of. I did replace the fuel fillter and the fuel pump twice and the water pump .this last fuel pump replacement I also replaced all the fuel lines going to the pump, regular and bowl I got a o ring kit for the bowl and a repair kit for the regulator

remove the oil cap and take a sniff....do you smell burnt wiring?

If you can get it to idle, disconnect one of the plugs at the valve cover harness at a time.....if it continues to run the same you've found the bad harness.....if it dies or idles worse you've found the good harness.

Really common for the UVCH to fail and cause the engine to run on 4 cylinders

I don't smell burnt wire and I can't get it to idel.I can gas rag it and get it to run for a few seconds and I hit the valve on the side and air comes out every time .could there be that much air in the system or do I have leak pulling in air from somewhere?

pull both valve covers and confirm that oil is coming from each injector at the oil spout. This will confirm that the injectors are firing and if so it's probably a fueling issue. If there is no oil then it's probably a harness or CPS issue.

I pulled the fuel lines off the tank switch and when I suck on the line I can not get fuel to come out it's like it is clogged but I can blow through it is there some kind deal were there has to be a little pressure on the return line to get fuel to come out of the other line?

I doubt it. Maybe try it with the fuel cap off?

Ok here's an update when I unplug the 2 5pin plugs on the driver side valve cover it does not make any noticable difference in the way it runs so I tested the plug on the harness side and I'm not getting any thing on one plug and I'm only getting voltage between 2 wires on the other pug.is there. Wireing diagram somewhere so I know where to test for continuity from and while running what should those. Plugs be reading thanks again for all of your help