Its all located up and directly in front of your spare tire. But if your filling issues are intermittent, you probably have charcoal pellets somewhere in the lines. This is NOT an uncomon issue for GM vehicles. In fact, many would love it if GM would scrap this horribly designed system. There are plenty of YT videos of people dropping the tank and back blowing pellets from the lines. This past Sunday I disconnected the lines to the evap canister and back blew from the gas tube inlet (where you put the gas nozzle) and tons of pellets came shooting out all over the floor from the lines.Where is it located on my '05 ??
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