Won't take fuel when filling?

Hello,

Typically when you will have difficulty filling up the fuel, it is due to a clogged evap canister or a faulty purge valve.

As you are filling up the tank the air inside unable to escape at the rate necessary and causing fuel to stay in the filler neck with triggers the gas pump to shut off and stop pumping fuel into the tank.

https://www.2carpros.com/articles/how-emission-control-systems-work

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.