my 14 1500 has the same problem. took it to the dealer. paid for a hour of check out and had it smoke tested. found rodent damage to the vent line that goes to the purge valve. its not covered under warranty.$998.65 to fix it. the line is part of the fuel tank. so I took it home and I am going to splice the line with rubber hose to fix it. thank god I have a lift. it will make the job a lot easier.
Believe it or not most insurance companies pay for proven rodent damage. You need to decide if it is worth turning in or not. I would wipe some dino oil or something on the lines and wiring. I saw one where squirrels ate the line, part of the nipple on the valve and the wiring, guy turned it in and his insurance paid for it.
