Abstract: A fuel pump (10) has a housing (12) which houses a motor (14) with a shaft (16) extending therefrom and an impeller (18) fitted thereupon for pumping fuel from a fuel tank to an internal combustion engine. The impeller (18) has a plurality of radially extending curved vanes (30) on an outer circumference (34) separated by a plurality of partitions (32) interposed between the vanes (30), the vanes (30) and partitions (32) defining a plurality of partly elliptical vane grooves (50). The vanes (30) are convexly curved in the direction of rotation (40) and have an obtuse inlet angle (.theta..sub.1) and an acute outlet angle (.theta..sub.2).