BOSCH Electric Fuel Pumps: Description

Bosch electric fuel pumps are positive displacement roller cell type, operated on 12 volts. Operating pressure is determined by one or more external fuel regulators in engine compartment. Pumps include an internal fuel pressure relief valve and an external, replaceable discharge check valve to prevent fuel from returning to tank when pump is off. Some pumps may also incorporate a damper chamber on discharge outlet to prevent pulsations in fuel lines.