One form of an apparatus for controlling a fuel gauge in a circuit mode of a vehicle includes: a vehicle mode determiner configured to compare a damping time with a response time, and to determine whether a driving mode of the vehicle is a general mode or a circuit mode; a fuel amount calculator configured to calculate a current fuel amount of the vehicle based on fuel consumption (FCO) by the engine or a change in the resistance of a fuel sender based on the driving mode of the vehicle; and a fuel gauge controller configured to control the fuel gauge based on the calculated current fuel amount, wherein the response time is a time taken for the fuel gauge to actually descend to a state ‘empty’ from a state ‘full’ due to fuel consumption by an engine.

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.

Vehicle fuel volume consumption estimation and accuracy analysis systems and methods are provided herein. An example method includes determining a fuel level percentage estimate or a fuel volume estimate for a vehicle at a first point in time and a second point in time for a trip, the fuel level percentage estimate or the fuel volume estimate being determined using a fuel tank model of a fuel tank of a vehicle, determining connected vehicle data that includes a determination of accumulated fuel consumed during the trip, and determining an accuracy of fuel tank model using the fuel level percentage estimate or the fuel volume estimate calculated at the first point in time and the second point in time, as well as the accumulated fuel consumed during the trip.

Vehicle fuel tank modeling systems and methods are provided herein. An example method includes introducing known volumes of fuel into the fuel tank, determining correlations of fuel level percentage values relative to the known volumes of fuel placed into the fuel tank, offsetting the correlations to compensate for unusable fuel volume of the fuel tank, selecting a non-linear fuel tank model that fits the offset correlations, and applying the non-linear fuel tank model to a target vehicle having a fuel tank with a fuel tank part number

A fuel level measurement system and method for liquified natural gas (LNG) powered machines is disclosed. An engine control module (ECM) receives fuel line pressure levels at a first time (e.g., a key-off event) and, again, at a second time (e.g., a key-on event). The ECM predicts an expected change in pressure from the key-off event to the key-on event based on various factors. If the change in pressure detected is greater than a threshold level different from the predicted change in pressure, the ECM determines a fill event and resets a current fuel level. The ECM tracks mass flow commands used to provide fuel to the engine to determine the consumption of fuel from the fuel tank and to determine a new current fuel level based on the amount of fuel consumed. The current fuel level is displayed on a fuel gauge.

A system of fuel delivery assemblies is provided. In one example, the system includes two separate fuel pump assemblies each having a reservoir with an interior to receive fuel. Each reservoir has at least one dimension that is different than the other reservoir. A housing is adapted to be separately coupled to each of the reservoirs so that a cartridge may be separately used with both fuel pump assemblies. The cartridge orients at least one fuel system component relative to the reservoir to which the reservoir is connected.

A method for operating an evaporative emissions control system for use with a fuel tank that stores and delivers fuel to an internal combustion engine is provided. A vent shut-off assembly is provided that selectively opens and closes at least one valve to provide overpressure and vacuum relief for the fuel tank. The vent shut-off assembly selectively vents to a purge canister. The at least one valve is closed whereby vapor is precluded from passing from the fuel tank to the purge canister. A purge event is performed wherein dedicated fresh air is drawn into the purge canister and delivered from the purge canister to the engine.

An agricultural product application implement includes a system and method for indicating an amount of fluid stored. A pressure transducer installed at the sump of a fluid tank electronically measures and displays a fluid depth. Instrumentation, such as an instrument cluster unit for the implement, is programmed via software to convert the voltage output of the pressure transducer to a volume measurement displayed in the operator's line of sight. Software within the instrument cluster unit for self-calibrating accounts for varying densities of different chemical solutions. The pressure transducer is used in conjunction with a transfer medium to prevent corrosive chemical solutions from contacting the pressure transducer.

A method for controlling a filling process of an operating fluid container, which can be filled by a filling device via a filling tube opening into the operating liquid container, wherein the operating fluid container is provided with a venting valve, which can be electrically operated between an open position, in which the operating liquid container is fluidically connected to the atmosphere, at least indirectly, by the venting valve, and a closed position, in which the operating fluid container is fluidically separated from the atmosphere by the venting valve.

Methods and systems are provided for determining a source of degradation stemming from a vehicle fuel system during a refueling event. Specifically, in one example a method may include responsive to a refueling lock that enables access to a fuel tank of a fuel system being manually unlocked in order to add fuel to the fuel tank, monitoring a pressure in the fuel system and a fuel level in the fuel tank during refueling the fuel tank, and indicating degradation of the fuel system as a function of both the pressure and the fuel level. In this way, fuel system degradation may be pinpointed during a refueling event that is enabled via manual unlocking of the refueling lock.