I don't think that the dealer will be able to help you. With my '08, I dropped the tank within the first month and installed a vent kit that has resolved the slow fill problem. With the fill kit, I can top-off the tank within about two minutes after the nozzle clicks off. Ant that's a fill right up to the top of the filler neck. I've installed one on each of the last 3 trucks I've had and that's the first thing that I would add to a new truck again.