The present disclosure provides a method for opening a refueling door of a vehicle. The method comprises adjusting a speed of opening the refueling door based on a fuel tank vapor pressure in response to a detected refueling request. Another aspect of the present disclosure provides a refueling door assembly for a vehicle. The refueling door assembly comprises a fuel tank; a refueling inlet to receive a fuel dispensing nozzle; a fuel fill line coupled between the fuel tank and the refueling inlet; a refueling door located at a vehicle body; an operating mechanism connected to the refueling door to open and close the refueling door; and a control module configured to open the refueling door responsive to a refueling request and control an opening speed of the operating mechanism based on a fuel tank vapor pressure.

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.

A method for controlling a pressure inside a fuel tank system on board a vehicle, the fuel tank system having a fuel tank and a venting circuit having at least one controllable pressure relief valve, the vehicle having a source of energy adapted to activate said at least one pressure relief valve so as to move it from a closed position to a pressure relief position. The method entails: detecting a key off event indicative of the vehicle shut-down; determining an amount of energy available at the source of energy; starting at least one pressure relief operation by verifying whether the amount of energy available is lower than a first predetermined threshold amount and, if the verification is positive, activating the at least one pressure relief valve; and terminating the at least one pressure relief operation.

A fuel filling apparatus and method for a bi-fuel vehicle using both gasoline and liquefied petroleum gas (LPG) as fuel are provided to an LPG fuel tank. The fuel filling apparatus and method are capable of temporarily burning a portion of LPG fuel after collecting a fuel portion, using a gasoline fuel tank and a canister, when the internal pressure of the LPG fuel tank in the bi-fuel vehicle is equal to or greater than an LPG filling pressure of a filling gun. Additionally, the internal pressure of the LPG fuel tank is decreased to a level below the LPG filling pressure of the filling gun, thereby achieving smoother LPG fuel filling of the LPG fuel tank by the filling gun.

A computer for a vehicle is programmed to receive fuel level data over a period of time during a refueling operation. Based on the fuel level data, the computer determines that fuel flow rate during one portion of the refueling operation is materially reduced relative to other portions of the refueling operation. The computer is programmed to output a failure mode based on the determination.

Methods and systems are provided for indicating whether a canister purge valve in a vehicle evaporative emissions control system is degraded. In one example, an air intake system hydrocarbon (AIS HC) trap temperature may be monitored during a refueling event, and responsive to an indication that the AIS HC trap temperature change is greater than a predetermined threshold, it may be indicated that the canister purge valve is degraded. In this way, diagnosis of whether a vehicle canister purge valve is degraded may be indicated without the use of engine manifold vacuum, and may be advantageous for vehicles configured to operate for significant amounts of time without engine operation, or without intake manifold vacuum.

Methods and systems are provided for detecting a fuel dispensing nozzle coupled to a fuel tank of a vehicle and providing a visual indication of the presence of the fuel dispensing nozzle to a vehicle operator. In one example, a method may include detecting the fuel dispensing nozzle within the fuel tank and illuminating a portion of a fuel tank access region. Further, vehicle operation may be adjusted based on the detection, and one or more alerts may be communicated to the vehicle operator.

A device equipped with a tank, includes: the tank to be filled with a fuel gas; a valve mechanism provided in the tank; a receptacle with which a nozzle of a fuel gas filling device is connectable; a first filling path, an upstream end of the first filling path communicating with the receptacle; a second filling path, a downstream end of the second filling path communicating with the tank through the valve mechanism; and a storage container hermetically communicating between a downstream end of the first filling path and an upstream end of the second filling path, and storing foreign matter contained in the fuel gas, wherein the storage container is positioned vertically above the downstream end of the first filling path.

A method for detecting and visualizing of a fuel type used in a vehicle is disclosed and may include, determining measurement data of the fuel are determined by at least one sensor during at least one of filling of the vehicle with a fuel and operation of the vehicle with the fuel, evaluating measurement data of the fuel by a control unit of the vehicle, and based on the determined measurement data for the fuel activating, deactivating, and/or changing at least one function in any of the vehicle interior and an outer area of the vehicle.

Data are received indicating an amount of pumped fuel provided to a vehicle fuel tank. A vehicle fuel tank fuel volume is received. Upon determining that a difference between the pumped amount of fuel and a detected change in a fuel volume in the fuel tank exceeds a threshold, a fuel pump is deactivated.