Methods and systems are provided for a detachable fuel pipe of a vehicle fuel system. In one example, a method may include, in response to a detected vehicle collision, removing physical and fluidic couplings between the detachable fuel pipe and a fuel tank. The method may further include sealing the fuel tank upon removing the couplings to the detachable fuel pipe.

The measured volume of fuel in a storage tank of a vehicle is determined by positioning a sensor within a storage tank holding the fuel. A processor is also located on the vehicle for receiving data relative to the volume of the fuel in the storage tank, the mileage of the vehicle, and vehicle location, date, and time, for transmitting such data to a remote or centralized server (“RS”). The RS also receives fuel dispensed data from a fuel dispensing station (“FDS”), including location, date/time, and volume of fuel dispensed to the storage tank of the vehicle. The RS then compares the data received from the vehicle processor with the fuel dispensed data to determine whether there are any discrepancies between the dispensed volume of fuel purchased, as indicated in the FDS data, and the measured increase of volume of fuel in the vehicle at the time of dispensing from the FDS.

An evaporation leakage checking system includes a pump, a pump passage unit, a tank passage unit, a specified passage unit, an atmosphere passage unit, a flow-passage area changing unit, an atmosphere valve unit, a pressure sensing unit, and a control unit. The control unit includes a calculating unit that calculates a leakage threshold, based on a first pressure, a first area, an Nth pressure, an Nth area, and a reference area that is predetermined, and a leakage checking unit that activates the pump, closes the atmosphere passage unit by changing the flow-passage area of the atmosphere passage unit by using the atmosphere valve unit, and checks the existence of the evaporation leakage based on the leakage threshold and a checking pressure that is the pressure sensed by the pressure sensor in a case where a communication between the tank passage unit and the pump passage unit is allowed.

Provided is an apparatus of discriminating reformulated fuel, which includes a fuel sensing unit including first and second electrode plates which are spaced and face each other, and a measuring part connected to the first and second electrode plates; a fuel control valve unit including a control valve part blocking the fuel passage and a second actuator driving the control valve part; and a control unit connected to the measuring part and the second actuator, and operating the second actuator based on a capacitance measured from the measuring part.

A valve assembly includes a seat separating a cavity of a valve body into a first cavity portion and a second cavity portion. The assembly includes a cover device separating the first cavity portion into a first pocket and a second pocket. The cover device defines at least one hole to provide fluid communication between an aperture of the seat and an outlet of the valve body via the hole. The cover device is movable between a rest position to restrict fluid communication between the aperture and the hole, and an actuated position to increase fluid communication between the aperture and the hole when a vacuum is created in the first cavity portion. The aperture is in direct fluid communication with the first pocket when in the actuated position. The outlet is in direct fluid communication with the second pocket when in the rest and actuated positions.

A fuel tank system for a vehicle includes a fuel tank, a fuel supply passage, a canister, an evaporated fuel gas supply passage, a communication passage, a backflow prevention device, first and second pressure measurement devices, and a control device. The fuel tank stores fuel supplied by the fuel supply passage. The canister adsorbs evaporated fuel gas generated in the fuel tank and supplied through the evaporated fuel gas supply passage. The backflow prevention device is provided in a pipe line of the fuel supply passage, and prevents a backflow of the fuel from the fuel tank. The first and second pressure measurement devices respectively measure pressures in the fuel supply passage and the evaporated fuel gas supply passage. The control device diagnoses the communication passage as being blocked when a difference between pressure values measured by the first and second pressure measurement devices exceeds a predetermined value.

A purge system of a fuel vapor includes a sensor sensing an operation of a refueling button, a fuel tank isolation valve provided on a vapor line connecting a fuel tank and a canister, an active purge pump provided on a purge line connecting the canister and an intake system, and a controller opening the fuel tank isolation valve and operating the active purge pump if the operation of the refueling button is recognized by the sensor to trap the fuel vapor generated from the fuel tank into the purge line.

Fuel tank (1) having: a wall (12) defining an internal volume (20) of the tank, and a temperature sensor (4) located inside the internal volume of the tank and at least partially enveloped with a material (21) having a thermal diffusivity comprised between 2×10.sup.−7 and 2×10.sup.−5 m.sup.2/s at 20° C. The temperature sensor measure an internal tank temperature, such as a vapor dome temperature.

A pressure sensor receptacle for the fastening of a pressure sensor to a motor vehicle tank, and a tank device that includes a pressure sensor receptacle. The pressure sensor receptacle includes a receptacle body having a substantially cylindrical shape with a first axial end forming a fastening portion of the receptacle body, the fastening portion configured for being plugged through an opening of the motor vehicle tank until a first bearing surface of the receptacle body bears against an edge of the opening, wherein the first bearing surface is configured to bound the fastening portion; and a locking body having a second bearing surface, the locking body configured for mounting and locking onto the fastening portion such that the second bearing surface bears against an opposite side of the edge of the opening to thereby clamp the pressure sensor receptacle to the edge of the opening by the receptacle body at one side and by the locking body at another side.

A fuel system for a machine may include a fuel tank configured to hold cryogenic fuel, a pressure sensor, and an electronic control module (ECM). The ECM may determine a change in pressure of the fuel between a first time and a second time, determine a predicted change in pressure of the fuel between the first time and the second time, and determine that the change in pressure and the predicted change in pressure is greater than a threshold. Based on the change in pressure and the predicted change in pressure being greater than the threshold, a notification may be displayed associated with an integrity of the fuel tank.