I started the truck with engine idle for a minute and heard a pop coming from the back and at first it sounded like a book fell into a box yet then I realized I don't have any books or boxes in the cargo area. After that sound the Check Engine light came on. No noticeable change in driving performance. It has been like this for two days and have been able to take it around town with no trouble.. It appears that the fuel pump is on its way out, truck stalled a few weeks ago half way on a 1000 mile round road trip yet gave no further trouble. I changed the gas cap, light is still on so must be something more serious. I'll have the fuel pump changed soon. Any ideas on how to find out exactly what this evap code is? Is there a way to get a more detailed code scan? I'm thinking the dealer could do it. Thanks.