Fuel vapor treatment apparatus

A fuel vapor treatment apparatus comprising:

• a fuel tank storing fuel of an internal combustion engine provided with a turbocharger;
• an adsorption unit adsorbing fuel vapor generated in the fuel tank;
• a first passage connecting the fuel tank and the adsorption unit;
• a first valve provided in the first passage;
• a purge passage connected between the first passage, between the adsorption unit and the first valve, and an intake passage of the internal combustion engine at a downstream side of a throttle valve;
• a check valve provided in the purge passage and opening in response to negative pressure in the intake passage;
• a second valve provided in the purge passage and positioned between the adsorption unit and the check valve;
• a second passage connected between the fuel tank and the intake passage at an upstream side of the turbocharger;
• a third valve provided in the second passage;
• a first pressure detector configured to detect pressure in the fuel tank;
• and
• a controller configured to control the first valve and the second valve,
• wherein
• when the internal combustion engine is in non-turbocharging operation, the controller is configured to open the first valve and the second valve, and
• when the internal combustion engine is in turbocharging operation, the controller is configured to close the first valve, and to open the third valve based on the pressure in the fuel tank detected by the first pressure detector.