Hi Liz; I did some looking around on the web and it seems to be related to over filling the tank. As long as you’re engine light isn’t coming on is good news. So try to stop fueling when the pump auto shuts off. What is happening is some gas is getting into the fuel evaporator system, which will eventually cost you major to replace the evaporator canister and probably the fuel purge valve, too. Not to mention if you’re fueling process is causing the pump to shut off instead of a good even flow. Is characteristic of evaporator problems I’m not sure if the purge valve is in the tank stem but there is a valve of sorts in the stem that shuts off when the evaporator engine code pops up causing that lengthy fill process.
(I also recommend doing your own research on customer complaints on your model and year to 2004 as to determine future costs that are inherently coming down the road as I have read.)
Jeff