Abstract: In a fuel tank, a pressure regulator is placed at an outside of a sub-tank and regulates a pressure of fuel of a pressure-regulation path, which is discharged from a fuel pump and is fed toward an outside of the fuel tank. A fuel recovery passage portion recovers excess fuel, which becomes excess at the pressure-regulation path, to the sub-tank. The sub-tank has an opening at a location that is higher than the suction filter. The fuel recovery passage portion is inserted from the outside of the sub-tank into the inside of the sub-tank through the opening while a gap is formed between the fuel recovery passage portion and the opening, so that the fuel recovery passage portion has an excess fuel outlet that discharges the excess fuel at a location that is on an inner side of the opening where an inside of the sub-tank is placed.

Abstract: A coupling stay includes a support inner peripheral surface extending along a rotational axis and providing radial support to a rotatable shaft portion of a pump unit, which extends along the rotational axis. A support lateral surface extends in a longitudinal direction and provides thrust support to the pump unit. The support inner peripheral surface extends from the support lateral surface in the transverse direction. A lock claw projects from the coupling stay. A lock projection projects from the pump unit and is operable to lock rotation of the pump unit relative to the coupling stay about the rotational axis upon fitting of the lock projection between the support lateral surface and the lock claw. A height of a contact part of the lock projection, which contacts the support lateral surface, is limited to be equal to or lower than the rotational axis.

Abstract: A suction filter, through which fuel is suctioned into a suction port of a fuel pump after filtering the fuel in an inside of a fuel tank of a vehicle, includes a filter screen and a plurality of fuel stoppers. The filter screen is placed to cover an inside space, in which a negative suction pressure is exerted from the suction port. The filter screen includes a bottom wall that forms the inside space and is formed as a permeable wall, through which the fuel and air are permeable, and the filter screen filters the fuel permeated through the permeable wall. The fuel stoppers are arranged along the bottom wall from a side, at which the suction port is located, toward an away side, which is away from the suction port. The fuel stoppers extend toward the bottom wall in the inside space.

Abstract: A coupling stay includes a support inner peripheral surface extending along a rotational axis and providing radial support to a rotatable shaft portion of a pump unit, which extends along the rotational axis. A support lateral surface extends in a longitudinal direction and provides thrust support to the pump unit. The support inner peripheral surface extends from the support lateral surface in the transverse direction. A lock claw projects from the coupling stay. A lock projection projects from the pump unit and is operable to lock rotation of the pump unit relative to the coupling stay about the rotational axis upon fitting of the lock projection between the support lateral surface and the lock claw. A height of a contact part of the lock projection, which contacts the support lateral surface, is limited to be equal to or lower than the rotational axis.

Abstract: A suction filter, through which fuel is suctioned into a suction port of a fuel pump after filtering the fuel in an inside of a fuel tank of a vehicle, includes a filter screen and a plurality of fuel stoppers. The filter screen is placed to cover an inside space, in which a negative suction pressure is exerted from the suction port. The filter screen includes a bottom wall that forms the inside space and is formed as a permeable wall, through which the fuel and air are permeable, and the filter screen filters the fuel permeated through the permeable wall. The fuel stoppers are arranged along the bottom wall from a side, at which the suction port is located, toward an away side, which is away from the suction port. The fuel stoppers extend toward the bottom wall in the inside space.

Abstract: In a fuel tank, a pressure regulator is placed at an outside of a sub-tank and regulates a pressure of fuel of a pressure-regulation path, which is discharged from a fuel pump and is fed toward an outside of the fuel tank. A fuel recovery passage portion recovers excess fuel, which becomes excess at the pressure-regulation path, to the sub-tank. The sub-tank has an opening at a location that is higher than the suction filter. The fuel recovery passage portion is inserted from the outside of the sub-tank into the inside of the sub-tank through the opening while a gap is formed between the fuel recovery passage portion and the opening, so that the fuel recovery passage portion has an excess fuel outlet that discharges the excess fuel at a location that is on an inner side of the opening where an inside of the sub-tank is placed.

Abstract: A common width direction, along which a passage width of a communication passage section and a passage width of a pressurizing passage are defined, is perpendicular to an extending direction of a flow restricting passage section. A first passage wall surface and a second passage wall surface, which define the communication passage section therebetween, are opposed to each other in the common width direction. The flow restricting passage section opens in the first passage wall surface. The second passage wall surface is concavely curved relative to the first passage wall surface toward the flow restricting passage section, so that the passage width of the communication passage section is progressively reduced toward the flow restricting passage section within a predetermined range that is equal to or smaller than the passage width of the pressurizing passage.

Abstract: The present disclosure provides a suction filter that filters a fuel inside a fuel tank of a vehicle. The suction filter includes a filter element, a partitioning wall element, a passage element, and an open/close valve. The filter element is disposed in and exposed inside of the fuel tank. The filter element filters a stored fuel stored in the fuel tank. The partitioning wall element is arranged in the inside space to divide the inside space into a first space and a second space that is lower than the first space. The inlet to take in the filtered fuel is open in the second space. The passage element defines an inflow opening open in the first space, an outflow opening to which a negative suction pressure is applied through the inlet, and a flow passage through which the filtered fuel flows.

Abstract: A swirling wall structure-extends from a lower side toward an upper side in a sub-tank, and a fuel flow, which is outputted into an inside of the sub-tank from a flow outlet of a diffuser passage opened toward a lateral side, is swirled by the swirling wall structure. The swirling wall structure-includes a curved wall surface and a U-turn wall surface. The curved wall surface is curved about a longitudinal axis, which extends from the lower side toward the upper side in the sub-tank, to bend the fuel flow outputted from the flow outlet. The U-turn wall surface extends continuously from the curved wall surface to make a U-turn of the fuel flow, which is bent by the curved wall surface.

Abstract: A swirling wall structure-extends from a lower side toward an upper side in a sub-tank, and a fuel flow, which is outputted into an inside of the sub-tank from a flow outlet of a diffuser passage opened toward a lateral side, is swirled by the swirling wall structure. The swirling wall structure-includes a curved wall surface and a U-turn wall surface. The curved wall surface is curved about a longitudinal axis, which extends from the lower side toward the upper side in the sub-tank, to bend the fuel flow outputted from the flow outlet. The U-turn wall surface extends continuously from the curved wall surface to make a U-turn of the fuel flow, which is bent by the curved wall surface.

Abstract: The present disclosure provides a suction filter that filters a fuel inside a fuel tank of a vehicle. The suction filter includes a filter element, a partitioning wall element, a passage element, and an open/close valve. The filter element is disposed in and exposed inside of the fuel tank. The filter element filters a stored fuel stored in the fuel tank. The partitioning wall element is arranged in the inside space to divide the inside space into a first space and a second space that is lower than the first space. The inlet to take in the filtered fuel is open in the second space. The passage element defines an inflow opening open in the first space, an outflow opening to which a negative suction pressure is applied through the inlet, and a flow passage through which the filtered fuel flows.

Abstract: A common width direction, along which a passage width of a communication passage section and a passage width of a pressurizing passage are defined, is perpendicular to an extending direction of a flow restricting passage section. A first passage wall surface and a second passage wall surface, which define the communication passage section therebetween, are opposed to each other in the common width direction. The flow restricting passage section opens in the first passage wall surface. The second passage wall surface is concavely curved relative to the first passage wall surface toward the flow restricting passage section, so that the passage width of the communication passage section is progressively reduced toward the flow restricting passage section within a predetermined range that is equal to or smaller than the passage width of the pressurizing passage.

Abstract: A support shaft connects between a flange and a pump unit. An intermediate member, which connects between the support shaft and pump unit, enables a relative positional change between the support shaft and the pump unit in an axial direction of the support shaft. The intermediate member limits a relative positional change between the support shaft and the pump unit in a circumferential direction of the support shaft. A resilient member is received in the support shaft and exerts a restoring force in an axial direction of the support shaft to urge the pump unit, which is movable relative to the support shaft in the axial direction, toward a bottom portion of the fuel tank.

Abstract: A support shaft connects between a flange and a pump unit. An intermediate member, which connects between the support shaft and pump unit, enables a relative positional change between the support shaft and the pump unit in an axial direction of the support shaft. The intermediate member limits a relative positional change between the support shaft and the pump unit in a circumferential direction of the support shaft. A resilient member is received in the support shaft and exerts a restoring force in an axial direction of the support shaft to urge the pump unit, which is movable relative to the support shaft in the axial direction, toward a bottom portion of the fuel tank.