According to the idea, can remove the gas pump (it is in the tank) and through this hole to search the tank. It is clear that if you pull out to remove the pump or the tank itself, I will not do it all the more in the street conditions (at the station and not for cheap). I'm asking what maybe you can forget about it if there is a large outlet and a fine mesh. If it doesn't get clogged, it won't spoil anything and won't affect fuel supply and traction... Logically there is a mesh in the filler neck...It is positioned as a mesh for coarse debris and leaves. It would be best to look for the cap there... i.e., remove the filler neck... You can go to
https://cararac.com/fuel_tank_size/ as an option.