This very well could be part of the problem with filling the tank. The code means there is excessive vacuum in the tank. This can be the result of a vent control valve that is stuck closed. When you fill the tank the fuel vapors go to the canister. When the engine is running the vant control valve has to open to allow the engine to pull the fuel vapor. If that doesn't happen, then the canister fills with vapors and the car will have issues when filling the tank.