A pressure adjuster may connect with a supply path connecting a fuel supply device and a fuel use device. The pressure adjuster may comprise a pressure chamber communicating with the supply path located closer to the fuel supply device than a check valve of the supply path, a communication chamber communicating with the supply path located closer to the fuel use device than the check valve, a valve member including a first pressure-receiving surface and switching between an open state and a closed state by pressure of fuel inside of the pressure chamber at the first pressure-receiving surface, a discharge path communicating with the communication chamber and configured to discharge fuel flowing from the communication chamber to outside of the casing when the valve member is in the open state, and a constriction portion disposed in the discharge path and constricting a cross section area of the discharge path.

An active drain liquid trap configured for use with a fuel tank system and constructed in accordance to one example of the present disclosure includes a trap body, a float and a pilot. The trap body defines a first inlet, a second inlet and an outlet. The first inlet is fluidly connected to a fuel pump. The second inlet is fluidly connected to a vapor line. The float is rotatably mounted about a float pivot. The pilot moves between an open and closed position. Rotation of the float causes the pilot to be urged into an open position and fluid to be drained from the trap body through the outlet.

In at least some implementations, a device includes a fuel system component having a body through which fuel flows, and a retention member body connected to the body of the fuel system component, the retention member body having one or more retainers that are flexible and resilient, and that extend outwardly from the retention member body and that are arranged to engaged spaced apart portions of an interior of a fuel tank to retain the position in the fuel tank of the fuel system component.

A submersible heat-exchanging apparatus for installation into storage tanks used for containing industrial oils. The apparatus comprises a cylindrical heat-exchange component with one end sealingly engaging a terminal plug and the other end sealingly engaging and communicating with a coupling manifold having opposed inflow and outflow ports. A flow-directing elongate insert is provided with one end configured to engage the coupling manifold interposed the inflow and outflow ports, and the other end provided with an aperture and configured for abutting the terminal plug. The flow-directing elongate insert slidingly contacts and cooperates with the inner walls of the heat-conductive conduit thereby partitioning the heat-conductive conduit into two opposed fluid transmission channels wherein one channel communicates with the inlet port and the other channel communicates with the outlet port. The coupling manifold sealingly engages an aperture provided in the storage tank whereby the heat-exchange component extends into the tank.

A fuel supply device includes a filter device, a pump, a suction pipe, and a bubble removing device. The filter device includes a first filter that filters a fuel, a filter chamber surrounded by the first filter, and a filter opening that is in fluid communication with the filter chamber. The pump has a pump suction port for drawing the fuel from the filter chamber. The suction pipe fluidly connects the filter opening to the pump suction port. The bubble removing device is disposed in at least one of the filter device and the suction pipe. The bubble removing device includes a valve device that is configured to discharge a bubble contained in the fuel to the internal space of the fuel tank, and a foreign matter regulator that is disposed between the valve device and the internal space and that regulates or prevents a foreign matter contained in the fuel from flowing into the fuel supply device.

A fuel return device to be mounted to a fuel tank for returning an excess fuel flowing out from an engine through a fuel return piping member to the fuel tank includes a fuel return pipe connected to the fuel return piping member. The fuel return pipe has an opening that is opened to an upper space formed in the fuel tank with the fuel return pipe mounted to the fuel tank.

A fuel tank check valve, which can prevent one portion of a coil portion of a torsion coil spring from being stuck on a stepped portion of a pivot includes a cylindrical member defining a flow channel for a fuel fluid; a flap axially supported on the cylindrical member through a pivot; and a torsion coil spring urging the flap in a closing direction. The pivot includes a large diameter portion around which a coil portion of the torsion coil spring is wound; and a first small diameter portion and a second small diameter portion coaxial with each other, and projecting into a shaft hole provided in either one of the cylindrical member or the flap. The first small diameter portion adjacent to the large diameter portion is off-centered to a side where the torsion coil spring presses against the pivot relative to the large diameter portion.

In a fuel supply device including a regulator and float-type level sensor, a fitting tube is formed integrally with an upper housing, a fuel pump being retained between the upper and lower housings. An outer periphery of a base part of the regulator is fitted into the tube. A regulator retaining member is formed as a separate member from the upper housing and retains the regulator in cooperation with the tube. The tube and the retaining member are joined via a snap-fit join part provided on fitting parts therebetween. The snap-fit join part is formed by engaging a projecting portion or a recess part, formed on an elastic piece provided on one of the fitting parts between the retaining member and the tube, with the recess part or the projecting portion formed on the other fitting part. A sensor support arm is molded as a unit with the retaining member.

A sender gauge adaptor includes an adaptor body pressed against a bottom wall of a fuel tank by a spring. The adaptor body includes a suction inlet part having a hollow cylindrical shape that opens downward. Recesses allowing fluid communication between the interior and the exterior of the suction inlet part and projection parts having a polygonal-shaped lower surfaces are alternately arranged in the circumferential direction along a lower end of the suction opening. The adaptor body includes a seat part in surface contact with the bottom wall of the fuel tank at a position below the lower surfaces of the projection parts.

The present disclosure is related to a method and an assembly for delivering fuel in a fuel tank (10), wherein the fuel tank comprises at least a first chamber (12) having a module pot (18) disposed therein and at least a first pump (30) adapted to deliver fuel from the first chamber to the module pot, and wherein a fuel pump (20) for delivering fuel to an engine is disposed within the module pot. In order to minimize the duty cycle of the pumps and therefore the energy consumption, it is proposed according to the present disclosure that a sensor device (22) is used to detect a predetermined minimum fill level in the module pot, wherein the pump disposed in the first chamber is activated when the minimum fill level is reached and is deactivated after a predetermined time interval or when a predetermined higher fill level in the module pot is reached.