Abstract: A diagnosis device for an evaporated fuel processing device includes: a pump arranged to pressurize or depressurize a system including the fuel tank and the canister; at least one pressure sensor arranged to sense a pressure within the system; and a fuel temperature sensor arranged to sense a temperature of a fuel within the fuel tank, the diagnosis device being configured to select a first leakage diagnosis using a positive pressure or a negative pressure existing within the fuel tank, or a second leakage diagnosis using a forcible pressurization or a forcible depressurization by the pump, based on a temperature difference between a fuel temperature at a start of driving, and a fuel temperature after an end of the driving, with respect to a request of a leakage diagnosis.

Abstract: An evaporated fuel processing device includes: an evaporated fuel passage connecting a fuel tank and a canister; a purge passage connecting the canister and an intake passage of an internal combustion engine a first purge control valve arranged to open and close the purge passage; a tank open passage connecting a position on an upstream side of the first purge control valve in the purge passage, and the tank; and a second purge control valve arranged to open and close the tank open passage, when the fuel tank becomes a negative pressure, the second purge control valve being opened to introduce an atmospheric pressure through the canister.

Abstract: An evaporated fuel processing device includes: an evaporated fuel passage connecting a fuel tank and a canister; a purge passage connecting the canister and an intake passage of an internal combustion engine a first purge control valve arranged to open and close the purge passage; a tank open passage connecting a position on an upstream side of the first purge control valve in the purge passage, and the tank; and a second purge control valve arranged to open and close the tank open passage, when the fuel tank becomes a negative pressure, the second purge control valve being opened to introduce an atmospheric pressure through the canister.

Abstract: A diagnosis device for an evaporated fuel processing device includes: a pump arranged to pressurize or depressurize a system including the fuel tank and the canister; at least one pressure sensor arranged to sense a pressure within the system; and a fuel temperature sensor arranged to sense a temperature of a fuel within the fuel tank, the diagnosis device being configured to select a first leakage diagnosis using a positive pressure or a negative pressure existing within the fuel tank, or a second leakage diagnosis using a forcible pressurization or a forcible depressurization by the pump, based on a temperature difference between a fuel temperature at a start of driving, and a fuel temperature after an end of the driving, with respect to a request of a leakage diagnosis.

Abstract: A canister device includes a main canister, a sub-canister, and a hose. The main canister includes a charging port, a purging port, and a main canister-side connection port. The sub-canister is separated from the main canister and located on a side of the main canister, and includes a drain port opened to the atmosphere and disposed on the same side as the main canister-side connection port of the main canister and a sub-canister side connection port disposed on the opposite side from the drain port. The hose provides fluid communication between the main canister-side connection port and the sub-canister-side connection port.

Abstract: A canister device includes a main canister, a sub-canister, and a hose. The main canister includes a charging port, a purging port, and a main canister-side connection port. The sub-canister is separated from the main canister and located on a side of the main canister, and includes a drain port opened to the atmosphere and disposed on the same side as the main canister-side connection port of the main canister and a sub-canister side connection port disposed on the opposite side from the drain port. The hose provides fluid communication between the main canister-side connection port and the sub-canister-side connection port.