I am hving trouble putting gas in mmy car without it constantly shutting off.

Yes, it is most likely a saturated carbon canister, and many times it is flooded with fuel because people keep 'topping off' after the nozzle first clicks off, so don't do that, if you do. It is several hundred for the canister and vent valve assembly and I would get both. Be sure to have the shop make sure that all the purge lines are clear of any carbon fragments. here are some shops: https://repairpal.com/hyundai-repair-in-evansville-indiana

canister . it could be but what you need is abreeder valve most of the time the filter onthat breeder valve is clug and damage either spider web o r water damage you should pay'diag some plase charge an hour .depend on the tech.is one hour labor if they give you 12k warrantie and a year ?