An engine apparatus includes an engine, a supercharger, an evaporated fuel treatment device, a controller and the engine apparatus is configured to determine a purge classification whether the evaporated fuel is a first purge in which the evaporated fuel flows dominantly in a first purge passage or a second purge in which the evaporated fuel flows dominantly in a second purge passage based on a relative ejector pressure that is a pressure of a suction port of the ejector and a value obtained by adding an offset amount based on a cross-sectional area of the second purge passage with respect to a cross-sectional area of the first purge passage to a pressure behind a throttle valve that is the pressure on a downstream side of the throttle valve of the intake pipe.

A tank venting system in accordance with the present disclosure includes a vent apparatus for regulating flow of fuel vapor between a fuel tank and a fuel vapor recovery system in a vehicle. The flow of fuel vapor is controlled to maintain the pressure of fuel vapor in the fuel tank at a certain pressure level or within a certain pressure range during different modes of use.

Disclosed is a method for diagnosing sealing in a fuel vapor recirculation system for an engine of a motor vehicle. An electronic module is integrated into the engine control unit that is woken up and placed on standby periodically while the engine is off, at the start and end of time intervals in order to perform a respective leak diagnosis, the fuel vapor temperature Tsys being estimated as a function of a time t ending at the start of each interval and starting when the engine is switched off according to the following equation, in which Tamb is the ambient temperature measured, Tsys0 is the fuel vapor temperature when the vehicle is switched off, and tsys is a system response time:
Tsys(t)=Tamb+(Tsys0−Tamb)e.sup.−t/tsys.

A vaporized-fuel treating apparatus includes a pump part for controlling a flow of purge gas and a heating part for controlling driving of the pump part and for generating heat. At least a part of the heating part is placed to be exposed in an atmosphere passage. The pump part is either placed in the purge passage or arranged connecting to the purge passage.

The present disclosure relates to hydrocarbon emission control systems. More specifically, the present disclosure relates to substrates coated with hydrocarbon adsorptive coating compositions and evaporative emission control systems for controlling evaporative emissions of hydrocarbons from motor vehicle engines and fuel systems. The hydrocarbon adsorptive coating compositions include particulate carbon having a BET surface area of at least about 1300 m.sup.2/g, and at least one of (i) a butane affinity of greater than 60% at 5% butane; (ii) a butane affinity of greater than 35% at 0.5% butane; (iii) a micropore volume greater than about 0.2 ml/g and a mesopore volume greater than about 0.5 ml/g.

An evaporated fuel processing device is installed to a vehicle having an internal combustion engine and a fuel tank and is configured to process evaporated fuel generated through evaporation of fuel in the fuel tank. A control device of the evaporated fuel processing device is configured to adjust an opening degree of a sealing valve based on a pressure of vapor-phase gas sensed with a pressure sensor and a concentration of evaporated fuel in the vapor-phase gas sensed with a concentration sensor and thereby adjust a supply amount of the evaporated fuel supplied to an air intake pipe at a time of executing a purge operation, in which the vapor-phase gas is purged from the fuel tank to the air intake pipe of the internal combustion engine.

An evaporative emissions control system configured to recapture and recycle emitted fuel vapor on a vehicle fuel tank is provided. The control system includes a first and second vent line disposed in the fuel tank, a first and second vent valve, a vent shut-off assembly, a purge canister and a control module. The vent shut-off assembly selectively opens and closes the first and second valves to provide overpressure and vacuum relief for the fuel tank. The control module regulates operation of the vent shut-off assembly based on operating conditions to vent the first and second vent valves to the purge canister. The vehicle fuel tank comprises a saddle tank having first and second lobes and a raised portion arranged generally at a top portion of the fuel tank. The first vent valve is arranged generally in the first lobe and the second vent valve is arranged in the raised portion.

A tank system (1) for a motor vehicle having an internal combustion engine to which fuel is supplied from a tank (2), wherein the tank (2) is assigned, in a ventilation path to the atmosphere (7), a flushable filter device (6, 6) for being loaded with hydrocarbon vapors of the fuel. The filter device (6, 6) has multiple mutually separate activated carbon filters (6). All of the activated carbon filters (6) are connected permanently in parallel. In this way, the ventilation resistance from the tank in the direction of the atmosphere can be kept low.

Provided is an evaporated fuel treatment device including a mounting part 90 provided in an intake pipe, and a purge pump 5 including a discharge part 71, a first introduction tube 61, and a second introduction tube 66. A pump body 6 of the purge pump 5 includes a pump tube 7 formed with a pump flow path 70 that extends along an axis O and that guides, to the discharge part 71, fluid to be introduced from the introduction tube 61. A reduced part 73 with a diameter decreasing toward downstream is formed in the flow path 70 on a side downstream of the introduction tube 61, and a connection flow path 78 that connects the introduction tube 66 and the flow path 70 is formed, and in a state where the pump body 6 is removed from the mounting part 90, the flow path 78 communicates with outside.

A saddle-riding vehicle includes: a canister in front of an engine and on one lateral side of a vehicle body in a vehicle widthwise direction with respect to a center axis of the vehicle body in the vehicle widthwise direction, the center axis extending in a front-to-rear direction; and an accessory stay extending in a vertical direction from a main frame that supports the engine. The canister has an elongate shape in a longitudinal direction of the canister, and the canister is disposed on an inner side of the accessory stay in the vehicle widthwise direction to be supported by the accessory stay with the longitudinal direction extending along the accessory stay.