I'm not sure if this is an interaction with the vapor recovery on the fuel pump nozzle, but topping up on some vehicles will introduce liquid fuel to the fuel v

I'm not sure if this is an interaction with the vapor recovery on the fuel pump nozzle, but topping up on some vehicles will introduce liquid fuel to the fuel vapor charcoal canister in the emissions system of the vehicle. It's not able to readily purge the liquid fuel and can case emissions codes and replacement of the fuel vapor canister can be needed to remedy.