Electric diaphragm type fuel pump for a motor vehicle

The pump has a membrane (50) with its peripheral end attached between a guiding body (20) and a hydraulic block. A piston (22) driving mechanism comprises a cam (42) having an eccentric cylinder that is driven, through intermediate gears, by an engine shaft. Axes of gears and the cam are parallel to the shaft and perpendicular to the direction of movement of the piston.