gas filling very slow

Hey Larry, There should be a vent for the fuel tank/evaporative system. I don't know exactly where it is but if you want to do this yourself I suggest getting a good repair manual and trying to locate the evaporative system vent. I would start by locating the charcoal canister and go from there. You can get a repair manual here: http://bit.ly/mitchell_repair_manuals_online This manual will also have technical service bulletins from Hyundai that might have some info if this is a common issue with your vehicle.