Apparatus for suppressing fuel evaporative gas emission

An apparatus for suppressing fuel evaporative gas emission comprising:

• a communication path that provides communication between an intake passage of an internal combustion engine and a fuel tank;
• a communication path opening/closing portion that opens/closes communication between the communication path and the intake passage;
• a tank opening/closing portion that opens or closes the fuel tank to or from the communication path;
• a canister that is provided to communicate between the communication path opening/closing portion and the tank opening/closing portion in the communication path, and adsorbs a fuel evaporative gas in the communication path;
• a negative pressure generation portion that generates a negative pressure in the canister and the fuel tank via a communication hole that provides communication between inside and outside of the canister;
• a pressure detection portion that detects an internal pressure of the fuel tank;
• a communication path control portion that performs communication path closing control to close the communication path opening/closing portion and open the tank opening/closing portion;
• and
• a sticking determination control portion that causes the negative pressure generation portion to generate a negative pressure in the fuel tank and the canister after the communication path closing control by the communication path control portion, further closes the tank opening/closing portion and then releases the negative pressure in the canister, and performs open sticking determination control to determine open sticking of the tank opening/closing portion based on the internal pressure of the fuel tank at the time.