Abstract: An impeller for a feed pump designed, in particular, as a side channel pump or as a peripheral pump has two disk parts connected fixedly in terms of rotation to one another. The disk parts can be manufactured in simply constructed molds, for example by the injection molding method, and can be provided with virtually any desired geometries of guide vanes. The impeller has high stability due to the rotationally fixed connection between the disk parts.

Abstract: A fuel pump is developed as a side-channel pump with two conveyor chambers for the conveying of a liquid to an outlet channel, and has two inlet channels arranged one behind the other seen in the direction of flow. One of the inlet channels debouches into a radially inwardly arranged partial-ring-shaped channel, while the other inlet channel is connected to a radially outwardly arranged partial-ring-shaped channel. In this way, the pressure within the liquid to be conveyed is increased stepwise and, thus, gas bubbles produced by a vaporization of the liquid are avoided.

Abstract: In a feed pump designed for feeding fuel in a motor vehicle and having two feed chambers (11, 12) located opposite one another, of which one is connected to an inlet port (18) and the other to an outlet port (19), the feed chamber (11) connected to the inlet port (18) has a calming region (21) which a compression region (22) adjoins. Fuel entering the feed pump is thereby first calmed. Subsequently, in particular, gas bubbles present in hot fuel are dissolved due to the vapour pressure in the fuel being exceeded.