A vehicle includes at least one of an electric vent valve configured to open and close an outside-air-introduction passage of a canister or an electric suction pump configured to suck gas in a gas passage through which the gas flows. The canister and at least one of the vent valve or the suction pump are disposed such that at least one of a virtual-left-right-center plane that includes a center in a left-right direction and is perpendicular to the left-right direction, a virtual-front-rear-center plane that includes a center in a front-rear direction and is perpendicular to the front-rear direction, or a virtual-up-down-center plane that includes a center in an up-down direction and is perpendicular to the up-down direction is located between a gravity center of the canister and at least one of a gravity center of the vent valve or a gravity center of the suction pump.

A fuel vapor emissions control device includes: —an absorbent filter; —a purge circuit including: a pump equipped with an intake and with a delivery outlet; an upstream duct; and a downstream duct. The pump includes an intake chamber into which the intake opens. The upstream duct is connected by one of its ends to the absorbent filter and via the other of its ends opens into the intake chamber. The downstream duct includes a double tubular wall defining two separate conduits.

Methods and systems are provided for conducting diagnostics to indicate whether a fuel system and/or an evaporative emissions system of a vehicle has a source of undesired evaporative emissions, or not. A method comprises conducting such a diagnostic via evacuating the fuel system to a target vacuum, then sealing the fuel system from atmosphere and monitoring a pressure bleed-up in the fuel system, and dynamically adjusting a pressure bleed-up threshold responsive to one or more conditions that impact the pressure bleed-up during the diagnostic, and indicating undesired evaporative emissions responsive to the pressure bleed-up reaching the adjusted pressure bleed-up threshold. In this way, interpretation of the results of such a diagnostic may be more robust, completion rates may improve, and engine operation may be improved.

A tank venting device for a fuel tank that supplies an internal combustion engine with a fuel includes a fuel vapor sorption system that is configured for reversibly storing fuel vapor in, and removing it from, the fuel tank, wherein the tank venting device includes at least one purge device, which is operable independently of the internal combustion engine, for applying a motive flow to the fuel vapor sorption system in the direction opposite from the fuel tank, so that the fuel vapor sorption system can be purged via a purge line, wherein the purge device includes at least one control device for controlling the motive flow.

A leak hole determination device in an evaporated fuel processing system. The leak hole determination device includes: a first pressure detector for detecting a first pressure in a fuel tank; a second pressure detector for detecting a second pressure in a canister; and a leak hole determiner for determining whether a leak hole is present. The leak hole determiner determines, after a limit pressure timing subsequent to a depressurization operation for depressurizing an inside of the system, whether a leak hole is present by using a difference between a change speed of a first pressure detected by the first pressure detector and a change speed of a second pressure detected by the second pressure detector.

An active dual purge system includes: an intake pipe, a compressor to compress air, a canister to collect an evaporation gas, a purge line extending from the canister to a front end of the compressor, a branch line branching off from the purge line and extending to a rear end of a throttle valve body, a purge pump installed in the purge line, a purge valve installed in the purge line, a vent valve installed in a vent line extending from the canister toward the atmosphere, a first sensor installed in the purge line, and a second sensor installed in the purge line, and a controller to perform different tests on the purge pump, the purge valve and the vent valve in different operating states, and diagnose whether at least one of the purge line, the branch line, or the vent line are abnormal using on-board diagnosis (OBD).

A system and method for leak check module including first and second solenoid valves. A first solenoid valve is configured to be coupled between a fuel vapor canister and atmospheric air for controlling air flow in a first flow path between the fuel vapor canister and atmospheric air. A pump is configured to be coupled to atmospheric air. A second solenoid valve is configured to be coupled between the pump and the fuel vapor canister for controlling air flow in a second flow path between the fuel vapor canister and atmospheric air through the pump.

A canister includes a plurality of activated carbon layers for adsorbing vaporized fuel and a purge pump for introducing purge air into the canister to cause purge gas containing the vaporized fuel to flow out of the canister. At least a part of the purge pump is placed in the chamber defined between the activated carbon layers.

Methods and systems are provided for a fuel system of a hybrid vehicle. In one example, a system may include a fuel tank selectively fluidly coupled to a fuel vapor canister via a first conduit that includes a fuel tank isolation valve and via a second conduit that includes a tank pressure control valve and a pump. In one example, the pump is a vacuum pump.

A module (14) for detecting a leakage, comprising a pressure sensor (8) and a pump (2) for generating pressure, is characterized in that, regarding the object of detecting and/or quantifying a leakage of an arrangement which has a large sealed volume, in a reliable manner with a compact device, the module (14) has a sealable reference volume (11) which can be connected in terms of flow by means of a valve (9) to a tank connection (10) and which can be disconnected therefrom in a flow-tight manner, wherein the pressure inside the reference volume (11) can be detected by the pressure sensor (8), wherein pressure can be generated inside the reference volume (11) by means of the pump (2) and wherein the reference volume (11) can be connected in a flow-conducting manner by means of a shut-off valve (4) via a reference aperture (5) with a defined flow cross section to an atmosphere outlet (1) and can be disconnected therefrom.