A valve device includes: a housing; a float valve; and a float valve support portion. The float valve support portion includes a support wall, a side wall, a first slit formed in the support wall, a second slit formed in the side wall, and an elastic piece defined by the first slit and the second slit. The elastic piece includes a first extending portion extending along the side wall, and a second extending portion extending from the first extending portion and capable of coming into contact with a bottom surface of the float valve.

A work vehicle including: a drive device that has an internal combustion engine for driving a vehicle body; a first tank for storing fuel to be supplied to the internal combustion engine; and a second tank for storing fuel to be supplied to the internal combustion engine; wherein the first tank is disposed in front of or behind the drive device, and the second tank is disposed below the drive device so as to be separated from the first tank by a predetermined distance.

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 sender gauge adaptor includes an adaptor body pressed against a bottom wall of a fuel tank by a spring. The adaptor body includes a suction inlet part having a hollow cylindrical shape that opens downward. Recesses allowing fluid communication between the interior and the exterior of the suction inlet part and projection parts having a polygonal-shaped lower surfaces are alternately arranged in the circumferential direction along a lower end of the suction opening. The adaptor body includes a seat part in surface contact with the bottom wall of the fuel tank at a position below the lower surfaces of the projection parts.

suction system for a liquid reservoir (3) it is provided, the reservoir being defined by side walls and a bottom wall (30), the system comprising one layer of permeable material (2), and the system it is characterized in that it comprises fastening means (21) for fixing said permeable layer (2) onto at least one wall (30) of said reservoir (3); suction means (1, 10, 16, 17) of said liquid arranged within said permeable layer (2); and connecting means (14, 41, 42) of said suction means (1, 10, 16, 17) to a suction duct for sucking said liquid; the arrangement being such that an internal volume (23) it is defined between said one layer of permeable material (2), said fastening means (21), and said at least one wall of said reservoir (30), wherein the liquid it is sucked into said internal volume (23) through said layer of permeable material (2) and through said suction means (1, 10, 16, 17).

Liquid fuel tank comprising a plurality of liquid level detection capacitive sensors, each arranged along an edge of the fuel tank such that the capacitance of said sensors varies with the volume of fuel present in the fuel tank, wherein an independent liquid level detection capacitive sensor is arranged along each edge of the fuel tank bottom and of the side walls; wherein the tank is electrically conductive and each level sensor comprises an electrically insulating plate arranged thickness-wise between sensor and tank, such that tank and sensors are capacitively uncoupled. Method for obtaining the fuel volume comprising: obtaining the reading of the liquid level detection capacitive sensors arranged on the edges of the tank; calculating the volume, corresponding to the fuel, of the geometric solid defined by the fuel tank and by the upper surface of the fuel as defined by the liquid level readings from the sensors.

A pressure variation in a fuel tank can be prevented, and leakage of liquid fuel can be prevented even if the fuel tank is inclined in a predetermined direction, without operation for opening and closing a breather passage. An engine generator includes: a first breather passage having an opening at a position above a liquid fuel in a tank bulge section when the engine generator is inclined to the right (corresponding to a first direction); and a second breather passage having an opening at a position above the liquid fuel in the tank bulge section when the engine generator is inclined in the left direction (a second direction).

Methods and systems are provided for executing a leak test diagnostic of a variable volume fuel tank. In one example, a method includes diagnosing a presence of an absence of a leak in a bellows via actuating a bellows valve fluidly coupling the bellows to a vapor canister during a key-off event.

A fuel-efficient and fuel-saving device is provided and includes a first fuel-modification device, an air-refining device, and a tubing-type fuel-modification device. The first fuel-modification device is arranged in a fuel tank. The air-refining device is arranged under a filter screen of an air filter of an internal combustion engine, and the tubing-type fuel-modification device is arranged above a pipeline between the internal combustion engine and the fuel tank. The first fuel-modification device includes a first metal box body and a plurality of nano far-infrared ceramic particles. The surface of the first metal box body has a plurality of uniformly arranged air holes. The plurality of nano far-infrared ceramic particles is arranged in the first metal box body. The ball diameter of the nano far-infrared ceramic particles is larger than the diameter of the air holes.

A fuel pressurization device configured to pressure-feed starting fuel to an engine. The fuel pressurization device includes a fuel chamber forming portion including a fuel chamber to which the fuel is supplied from the pump and whose internal volume is variable, and a spring configured to bias the fuel chamber forming portion so as to reduce the volume of the fuel chamber and to pressure-feed the fuel in the fuel chamber.