I'm working on an 04 3500 4x4 and when sitting overnight, the next morning, it will idle and get me down the road a few miles and then dies. If I let it sit a few minutes, it starts and idles, but I can't go down the road. I'm thinking it would be the lift pump. It has 42,000 miles on it and I'm wondering if it's covered under warranty. I had a friend get her 04 lift pump converted to the in-tank model under warranty and I'm wondering if this would be the case here if covered under warranty. What is the warranty on the lift pumps? Thanks. 
