Evaporated fuel processing device

An evaporated fuel processing device comprising:

• a fuel tank;
• a vapor passage through which evaporated fuel generated from fuel in the fuel tank flows;
• a closing valve configured to open and close the vapor passage;
• a pressurizing pump configured to pressurize gas in the vapor passage downstream of the closing valve toward the closing valve;
• a first pressure sensor configured to detect a pressure in the fuel tank directly or indirectly;
• and/or a second pressure sensor configured to detect a pressure in the vapor passage downstream of the closing valve directly or indirectly;
• and
• a controller,
• wherein
• gas in the vapor passage flows through the closing valve when the closing valve is in an opened state, and the gas in the vapor passage does not flow through the closing valve when the closing valve is in a closed state, and
• when the closing valve moves toward an open side in the closed state with the pressurizing pump pressurizing the gas in the vapor passage downstream of the closing valve toward the closing valve, the controller specifies a valve-opening-start position based on the pressure detected by the first pressure sensor and/or the pressure detected by the second pressure sensor, wherein the valve-opening-start position is a position where the closing valve transitions from the closed state to the opened state.