An aircraft auxiliary fuel tank system comprising a master tank and a plurality of slave tanks fluidly connectable to the master tank in series. The slave tanks may each include a valve assembly comprising a biased plate that is movable for throttling fluid during a deceleration event when the slave tanks are connected to the master tank or other slave tanks. A rail assembly is provided to assist in the easy installation and removal of the slave and master fuel tanks.

A self-sealing bladder including a liquid impermeable material layer that is compatible with a liquid held in the bladder and a plurality of flexible sealing flaps extending inwardly from the interior surface of the liquid bladder wherein, in response to a hole formed in the bladder that establishes an unwanted flow of liquid from the bladder, at least one sealing flap responds to the unwanted flow of fluid by bending towards and at least partially covering the hole.

There is provided a fill-up restriction valve including: a housing; and a float valve. The housing includes a housing body including a body-side peripheral wall, and a lower cap including a cap-side peripheral wall, the lower cap being installed to a lower side of the housing body by a joint portion. The joint portion includes an annular groove, an insertion wall portion, and an annular protrusion formed on one of the insertion wall portion and the annular groove, or an annular seal member disposed between the insertion wall portion and the annular groove. The annular protrusion or the annular seal member is configured to be in pressure-contact with the annular groove and the insertion wall portion in a state where the insertion wall portion is inserted into the annular groove.

A self-sealing liquid bladder having a plurality of layers including a liquid impermeable material layer that is compatible with a liquid held in the bladder and at least one sealing layer that is conformally arranged to span a surface area of the liquid impermeable material layer and that is separated from a liquid held in the bladder by the liquid impermeable layer, the sealing layer including a sealing means that, in response to a penetration of both the liquid impermeable material layer and the sealing layer, substantially seals the penetration.

Systems and methods for installing and sealing a fuel pump in a fuel tank are disclosed. In one embodiment, a system for installing and sealing a fuel pump in a fuel tank may include (1) a fuel tank with an opening in a surface thereof; and (2) a fuel pump hanger assembly, the fuel pump hanger assembly comprising; (a) a plurality of assembly screws; (b) a plurality of clamping lugs configured to thread onto the plurality of assembly screws and engage an inside surface of the fuel tank; (c) a top plate further comprising; (i) a bearing surface configured to engage an external fuel tank surface; (ii) a plurality of through holes proximate the perimeter of the top plate and perpendicular to the bearing surface; (iii) a plurality of bosses, each of the plurality of bosses adjacent to each through hole, configured to guide and position the each clamping lug; and (d) a gasket positioned between the top plate and the fuel tank.

A fuel door assembly for a motor vehicle is provided. The fuel door assembly includes a housing, a fuel door and a door seal. The fuel door is hingedly supported by the housing for rotation between an open position and a closed position. The door seal includes a proximal edge supported by the housing and a distal edge separated from the housing. The door seal has an arcuate shape extending from the proximal edge to the distal edge when the fuel door is in the open position.

A fuel tank vent valve includes a venting apparatus for regulating discharge of fuel vapor from a fuel tank and admission of outside air into a fuel tank. The vent valve is used to regulate pressure in a fuel tank.

A self-sealing liquid bladder having a wall including plurality of connected cells each cell having an elastic wall portion and a stiffened wall portion and at least one source of pressure associated with one or more of the plurality of cells.

Systems and methods for installing and sealing a fuel pump in a fuel tank are disclosed. In one embodiment, a system for installing and sealing a fuel pump in a fuel tank may include (1) a fuel tank with an opening in a surface thereof; and (2) a fuel pump hanger assembly, the fuel pump hanger assembly comprising; (a) a plurality of assembly screws; (b) a plurality of clamping lugs configured to thread onto the plurality of assembly screws and engage an inside surface of the fuel tank; (c) a top plate further comprising; (i) a bearing surface configured to engage an external fuel tank surface; (ii) a plurality of through holes proximate the perimeter of the top plate and perpendicular to the bearing surface; (iii) a plurality of bosses, each of the plurality of bosses adjacent to each through hole, configured to guide and position the each clamping lug; and (d) a gasket positioned between the top plate and the fuel tank.

Methods and systems are provided for indicating restrictions in a fuel system vapor recirculation line. In one example, a fuel tank is evacuated responsive to a fuel level below a threshold, and if the vacuum is relieved via a negative pressure relief valve in a capless fuel filler system, the negative pressure relief valve is indicated to be functional such that, responsive to a fuel level greater than a threshold, the fuel system may be evacuated and a restriction may be indicated in the vapor recirculation line responsive to the negative pressure valve not relieving the applied vacuum. In this way, restrictions in the vapor recirculation line may be rapidly diagnosed and excessive loading of a fuel vapor canister may be prevented, thus reducing the potential for evaporative emissions being released to the atmosphere and prolonging fuel vapor canister function.