Fuel isolation systems, apparatuses and methods are described. In some embodiments, a system comprises a fuel tank, a fuel pump, an engine, a firewall, a fuel line from the fuel tank to the engine, a connector coupled inline with the fuel line on a cold side of the fuel line, a normally closed valve coupled to the connector, an air feed line coupled to an ullage of the fuel tank and to the valve. In the event of an engine fire condition, a control unit outputs signaling to turn off the fuel pump and open the valve to introduce air from the ullage into the fuel line. The introduced air provides a siphon break in the fuel line such that the fuel cannot be siphoned and the only fuel that can pass the firewall is the remaining fuel in the fuel line downstream of the connector and the introduced air.

The present invention relates to a method for controlling a fuel tank arrangement (100) connected to a prime mover (101) for propulsion of a vehicle. More particularly, the fuel tank arrangement (100) comprises a first (102) and a second (104) fuel tank connected to the prime mover of the vehicle.

A signal transmitter for a fill level sensor, a conductor path arrangement is printed on a resistor arrangement. The resistor arrangement is located below a slideway and is accessible between conductor path sections for trimming of the resistor. The signal transmitter is of particularly compact configuration and can be produced at low cost.

A motor vehicle with a pressure vessel system includes at least a first pressure vessel arranged in a first region of the motor vehicle and at least one second pressure vessel arranged in a second region of the motor vehicle having a lower intrusion probability than the first region. Fuel is preferentially removed first primarily from the at least one first pressure vessel. When the lower limit of fuel level or fuel temperature is reached in the at least one first pressure vessel, fuel is removed from the at least one second pressure vessel. If the fuel supply rate from the at least one first pressure vessel is lower than an overall fuel supply rate for an energy converter, fuel is removed from the at least one second pressure vessel to meet the overall fuel supply rate needed by the energy converter.

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 evaporative emissions control system includes a first vent valve configured to selectively open and close a first vent, a second vent valve configured to selectively open and close a second vent, a fuel level sensor configured to sense a fuel level in the fuel tank, a pressure sensor configured to sense a pressure in the fuel tank, an accelerometer configured to measure an acceleration of the vehicle, and a controller configured to regulate operation of the first and second vent valves to provide pressure relief for the fuel tank. The controller is programmed to determine if a refueling event is occurring based one signals indicating the fuel level is increasing, the pressure in the fuel tank is increasing, and the vehicle is not moving, and open at least one of the first and second vent valves based on determining the refueling event is occurring.

Example methods and apparatus to ensure grounding between vehicles during a vehicle-to-vehicle refueling operation are described herein. An example vehicle described herein is to receive fuel from a refueling vehicle via a vehicle-to-vehicle refueling operation. The example vehicle includes a fuel tank having a vent passageway, a valve coupled to the vent passageway, and a controller to close the valve if the vehicle and the refueling vehicle are not electrically coupled during the vehicle-to-vehicle refueling operation.

Methods and systems, using a controller (20), for performing de-rate operation of an engine (12) is disclosed. Controller (20) includes a de-rate condition detection unit (204), an operational parameter adjustment unit (206), and a de-rate condition monitoring unit (208). De-rate condition detection unit (204) detects a low fuel condition based on a current delivery pressure level of the engine (12) detected at least one of: in a fuel tank (24) and along an inlet fuel rail (38) connecting the fuel tank (24) to the engine (12). Operational parameter adjustment unit (206) performs the de-rate operation on the engine (12) by adjusting one or more operational parameters related to an engine (12) load based on the detected low fuel condition. De-rate condition monitoring unit (208) monitors the detected low fuel condition for a predetermined time period in response to the operational parameter adjustment performed by operational parameter adjustment unit (206).

A work vehicle including a drive device (10) having an internal combustion engine (12) for driving a vehicle body (1) has: a first tank (32) that is disposed in front of or behind the drive device, and stores fuel (9) to be supplied to the internal combustion engine; a second tank (34) that is disposed below the drive device so as to be separated from the first tank by a predetermined distance, and stores the fuel to be supplied to the internal combustion engine; a first storage amount detection part (70) that is disposed in the first tank, and detects an amount of the fuel stored in the first tank; and a second storage amount detection part (80) that is disposed in the second tank, and detects an amount of the fuel stored in the second tank.

Methods and systems are provided for improving fuel economy and reducing undesired emissions. In one example, a method may include in response to an engine speed being within a first threshold speed of an engine idle speed during a speed reduction request with engine cylinders unfueled, maintaining the cylinders unfueled, and controlling the engine to a desired stopping position responsive to the engine speed being greater than a second threshold speed lower than the idle speed. In this way, fuel usage and emissions may be reduced and engine restart requests may be conducted at least in part via vehicle inertia.