Problem by loading fuel

Good night.
I have a Hiunday Accent 2002. A month ago I have the following problem: every time I am going to put gasoline, a full tank switch is activated. It is constantly activated so the fuel gun cannot be released and it must be activated again and again when the mechanism jumps. It is quite uncomfortable because it takes a long time.
Thanks for helping me to know what it will be and what repair I can do.
Greetings

I understand that it is a design problem of the 2002 Hyundai, where the tube that feeds the fuel tank is very thin and grabs air so the pump gun is constantly triggered and sometimes spills the fuel. I think that's what you mean ...

The gasoline guns have a closed system when a tank is filled, there would be to do if you do not have an obstruction at the tank entrance ....... well also the tanks are filled with gasoline gases and there is a valve that lets it release 'canister'

Yes that was what I meant ... thank you. But how strange, it didn't happen before.

If I read that canister out there, that also could be. Thank you so much!