I believe it is something with the fuel pickup or something? When the gas light comes on and the distance to empty gets below 60miles. I go to crank the truck and the motor turns over for like a few seconds and stops. I try again and it turns over again for a bit and cranks up then it shuts off. I try again and then it finally cranks up. I took it to the dealership where I bought it from but the diesel technician had no clue what it could be. This only happens when the gas light is on. Again I believe that it has something to do with the pickup or a check valve that is messed up and it's letting air get into the fuel line. Any ideas?