Patent ID: 6722857
Filing Date: 2004-04-20
Classification: F02M,F04B

Abstract:
A pump assembly (1) for fuel, comprising a main feed pump (2) and a prefeed pump (3), which prefeed pump (3) pumps fuel, via a fuel line (4), out of a tank (5) and into a chamber (2a) of the main feed pump (2), a return line (9) downstream of the chamber (2a) for fuel to flow as a lubricant back to the tank (5), and a feed course (13) leading to a metering unit (14) and on to the main feed pump (2), said prefeed pump (3) being mechanically driven, and a zero-feed course (18) having a zero-feed throttle (19) therein branching off from the feed course at a point which is between the metering unit (14) and the main feed pump (2), and discharging into the fuel line (4) on the intake side of the prefeed pump (3).