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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
It sounds like either the pumps are screwed up or user error. The pump is supposed to sense when the tank is full and click off but if you top off it's your fault.
Have not had the problem with the truck, but have had it in the past. Because of it, I got in the habit of never "topping off" after the pump clicks off. I always pay with a C.C. anyway, so I could care less if it stops at like $47.73...