| 摘要 |
A fuel vapor treatment device is provided with: a shutoff valve (21) for opening and closing a fuel vapor passage (16) between a fuel tank (2) and a canister (3); a first purge control valve (23) for opening and closing a purge passage (19) between the canister (3) and the intake passage (17) of an internal combustion engine (1); and a second purge control valve (32) for opening and closing a tank opening passage (31) between the canister (3) and the fuel tank (2). When pressure is released for fuel filling operation, the second purge control valve (32) having a small diameter opens before the shutoff valve (21) opens, and gas blowing at the time of opening of the shutoff valve (21) is prevented. Whether or not the second purge control valve (32) is seized is diagnosed on the basis of the amount of pressure reduction after the second purge control valve (32) is opened. |
