When a driver manipulates a fuel filler lid switch, a tank shutoff valve is opened. Then, time t is calculated, and then, remaining time, obtained by subtracting elapsed time from the time t, is presented on a display device. If the fuel filler lid switch is manipulated again, the tank shutoff valve is closed to seal a fuel tank, and a message to the effect that opening action of the fuel filler lid is cancelled is presented on the display device. If the time t has elapsed without the fuel filler lid switch being manipulated again, the fuel filler lid is opened, determining that internal pressure in the fuel tank has decreased to a level predetermined to ensure that the fuel tank can be filled safely without fuel or fuel evaporative gas spouting from the fuel tank.