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02 dodge 2500. When I bought the truck the lift pump had been removed and a in the tank fuel pump had been installed. A few weeks ago the truck quit on me like it had been ran out of fuel and it still had a 1/4 tank or so. after changing the fuel filter and bleeding the lines the truck fierd up and I drove it around the next day the truck did the same thing when I was leaving the store. Since then Ive changed the fuel pump and injection pump. If i let the truck sit sometimes it will not start until I bleed the lines and sometimes it starts fine. It has also cut off on me going down the road just like it did before. What are some things I can look for? thanks in advance for the help

you might check to see if you have a leak somewhere....the fuel is leaking out, therefore your fuel system has air in it, and loses pressure. also, see if the fuel pump is kicking on properly

Definitely sounds like air is getting in. Below are some PDFs that may help you out.

*On the first PDF check # 9 and make sure it is tight.

*The second possible thing could be the Overflow on the IP.
This is a great write up on how to check that: Mopar1973Man's Dodge Cummins Articles - Bosch VP44 Injection Pump Overflow Valve