Ullage float assemblies for fuel tanks are disclosed including a guide member with a retaining element mounted to a valve body which includes a first valve port and a second valve port in fluid communication. Methods of preventing spillage of fuel from a fuel tank during a refueling and a diurnal fuel volumetric expansion event are also disclosed. The assemblies and methods.

Methods and systems are provided for vehicle fuel tanks including multiple reservoirs. In one example, a method may include opening a canister purge valve of a fuel system responsive to a fuel level of a fuel tank transitioning above a first threshold fuel level, and closing the canister purge valve after flowing a pre-determined amount of fuel to the fuel tank while the canister purge valve is open.

A system for recovering fuel vapor during delivery of fuel by a mobile fueler includes a storage tank covered with a layer of insulation, a supply pump connected to the storage tank for delivering fuel therefrom, and a fuel dispensing assembly, preferably a coaxial hose and nozzle, including a supply outlet for delivering fuel to a vehicle being fueled, and a vapor recovery inlet proximate the supply outlet. A diverter valve diverts a portion of the fuel in the supply line, and a vacuum jet pump is connected to the storage tank and, by a vapor line, to the vapor recovery inlet, which is driven by the diverted fuel to create a vacuum in the vapor line to draw vapor into the vapor recovery inlet, through the vapor line, and into the storage tank.

Apparatus (2) for monitoring a set of fuel dispensers (10.sub.1, 10.sub.2, . . . 10.sub.N) of filing stations (1.sub.1, 1.sub.2, . . . 1.sub.M), for providing fuel stored in tanks (11) to vehicles, may include interfaces (21) to receive measurements from output probes (30.sub.1, 30.sub.2, . . . 30.sub.N) measuring fuel flowing through nozzles (11.sub.1, 11.sub.2, . . . 10.sub.N); measurements from amount probes (31) measuring a stored amount contained within the tank; and receipt data of fuel delivered; a memory (22) to store at least part of said measurements, and a computing means (23). The computing means may be configured for: determining two subsequent fuel deliveries for which stored amounts measured at the start of said deliveries are substantially equals; determining a suspicious situation by comparing said receipt data corresponding to said subsequent fuel deliveries with the sum of measurements provided by said output probes during the time period between these two subsequent deliveries; and triggering an action when a suspicious situation is determined.

A gaseous hydrogen storage and distribution system with a cryogenic supply and a method for the cryogenic conversion of liquid hydrogen into high-pressure gaseous hydrogen are provided. The gaseous hydrogen storage and distribution system includes pressuring liquid hydrogen from a cryogenic tank using a low pressure liquid pump before vaporization within a relatively small vaporizer. The resulting high pressure gaseous hydrogen is transferred to a plurality of storage tanks at ambient temperature according to a desired fill sequence. The high pressure hydrogen gas is subsequently distributed from the storage tanks through a hydrogen fueling dispenser according to a desired dispensing sequence. The present system and method provide improvements in operational safety, eliminates the use of high pressure gas compressor, and minimizes boiling off and ventilation losses at a reduced cost when compared to existing thermal compression storage systems.

A fuel truck is used to deliver fuel to vehicles parked at one or more locations. While the fuel truck is servicing vehicles, a user of the fuel truck uses a mobile device to assist in the management of fuel delivery. Specifically, each vehicle being serviced has a tag that is a capable of being read by the mobile device. The tag communicates information that identifies the vehicle, and the mobile device communicates with a meter on the fuel truck to track how much fuel is delivered to the identified vehicle. The mobile device also controls the meter such that fuel is allowed to flow only when the mobile device is aware of which vehicle is receiving the fuel. Thus, over time, the mobile device is able to track accurately which vehicle is receiving fuel so that the amount of fuel delivered to each vehicle can be precisely determined.

A fuel truck is used to deliver fuel to vehicles parked at one or more locations. While the fuel truck is servicing vehicles, a user of the fuel truck uses a mobile device to assist in the management of fuel delivery. Specifically, each vehicle being serviced has a tag that is a capable of being read by the mobile device. The tag communicates information that identifies the vehicle, and the mobile device communicates with a meter on the fuel truck to track how much fuel is delivered to the identified vehicle. The mobile device also controls the meter such that fuel is allowed to flow only when the mobile device is aware of which vehicle is receiving the fuel. Thus, over time, the mobile device is able to track accurately which vehicle is receiving fuel so that the amount of fuel delivered to each vehicle can be precisely determined.

A remote fuel supply system comprising a fuel transfer unit for managing the flow of fuel from a remote fuel tank and onboard auxiliary tank to an engine. The system may include an engine unit comprising an onboard auxiliary tank, a remote fuel supply unit comprising a remote fuel tank, and a fuel transfer unit. The fuel transfer unit may include a housing featuring multiple inlets for receiving fresh fuel from the fuel supply unit and unburnt fuel from the engine unit, and the housing may include multiple outlets connected to diverter valves for selectively transferring fuel to the engine unit from the fuel supply sources; namely, the fresh fuel from the fuel supply unit and/or the unburnt fuel from the engine unit.

A remote fuel supply system comprising a fuel transfer unit for managing the flow of fuel from a remote fuel tank and onboard auxiliary tank to an engine. The system may include an engine unit comprising an onboard auxiliary tank, a remote fuel supply unit comprising a remote fuel tank, and a fuel transfer unit. The fuel transfer unit may include a housing featuring multiple inlets for receiving fresh fuel from the fuel supply unit and unburnt fuel from the engine unit, and the housing may include multiple outlets connected to diverter valves for selectively transferring fuel to the engine unit from the fuel supply sources; namely, the fresh fuel from the fuel supply unit and/or the unburnt fuel from the engine unit.

A backsplash protector device for use with a fuel tank or a motorcycle gas tank to prevent fuel from jumping or splashing from the opening of the gas tank during a fuel filling operation, and a vapor tube lock device for application to a gas nozzle to hold the vapor tube of the gas nozzle in a retracted or compressed position to permit a greater portion of the nozzle to be inserted through the backsplash protector and into the fuel tank without obscuring or blocking the user's ability to visually monitor the fuel flow, the fuel level within the tank, and/or the relative position of the nozzle (and the nozzle end from which fuel flows) within the tank.