Aggregate for feeding a fuel from tank to an internal combustion engine of a motor vehicle

An aggregate for feeding a fuel from a fuel tank to an internal combustion engine of a motor vehicle, said aggregate comprising a feed pump formed as a flow pump (10), said flow pump (10) comprising a rotatable impeller (12) arranged in a pump chamber (24) and a drive member (14) for rotatably driving said impeller about a rotation axis (13), two opposing walls (26,28) bounding the pump chamber (24) in opposite directions along the rotation axis (13) of the impeller (12) and an annular wall (30) bounding the pump chamber (24) in a radial direction relative to the rotation axis (13) of the impeller (12),

• wherein said impeller (12) has two opposite sides and a peripheral rim of radially exteriorly directed vanes (32) on each of said opposite sides thereof, said vanes (32) are spaced from each other in a circumferential direction, each of said two opposing walls (26,28) bounding the pump chamber (24) is provided with a circular arc-shaped groove (38,42) and said circular arc-shaped grooves extend partially circumferentially around the rotation axis (13) of the impeller (12) at a distance from the rotation axis approximately equal to a distance of said vanes from said rotation axis (13) so that said grooves (38,42) together with said vanes (32) of the impeller (12) form respective feed ducts (44), each of said arc-shaped grooves (38,42) has a beginning and an end along a circumferential extent thereof in a rotation direction (11) of said impeller (12) and is provided with an inlet opening (40) at said beginning and an outlet opening (18) at said end, the vanes (32) of the impeller (12) have radial outer ends and an outer ring (36) is connected to the vanes (32) at said radial outer ends, said impeller (12) has an additional peripheral rim of radially exteriorly directed additional vanes (101) on each of said opposite sides in said outer ring (36), said additional vanes (101) are spaced from each other in a circumferential direction, said additional vanes (101) of said additional rim together with said opposing walls (26,28) and/or said annular wall (30) form at least one flow duct (94) extending circumferentially in an at least partially circular arc-shaped manner around the rotation axis (13) of the impeller (12) so that a pressure build-up occurs in the rotation direction (11) of the impeller (12), the additional rim of said additional vanes (101) in said outer ring (36) of said impeller is divided into two rim portions of said additional vanes (101) on respective opposite sides of said outer ring (36), said two rim portions are separated from each other in an axial direction by an annular separating member (102) of said outer ring (36), and said additional vanes are arranged with equal spacing (e) in the rotation direction of said impeller (12) and are shaped to optimize fluid flow.