I have a 93' Dodge 2500 truck with Cummins engine that I bought from my cousin. It's been running great for many years. My cousin bought a newer Dodge because the 93' started giving him trouble. Sometimes it wouldn't start right away, other times it would start fine. This went on for a couple months, then one day it refused to start. He had to get it towed home. He and his brother worked on it in their spare time for a couple of weeks. They replaced the lift pump but it didn't help. They put on an electric fuel pump and that didn't make any difference. Anyway it hasn't run since. After I bought it, I replaced the battery because the engine was cranking slow. The new battery didn't help. It sounded like the engine was right on. I cracked the injector lines and plenty of fuel came out. I'm wondering why it won't start. Any suggestions or ideas are welcome. Thank you.