A friend of mine has a 2001 3500 Auto, completely stock, no mods, 110,000 miles. Truck ran fine last night, got up to leave the next morning and could not get it to start. It spins over but just won't hit. We changed the fuel filter. No luck. While the filter was out, we turned the ignition on and the lift pump seemed to be working. Would like to know if anyone has any other suggestions?