Feed pump, for fuel injection and hydraulic valve control systems, has primary and secondary pump elements with associated low and high pressure zones

摘要

The fuel pump consists of a primary low pressure side (11) and a primary high pressure side (13) and additionally the means (3) to transfer the fuel from the primary low pressure side to the primary high pressure side. The system is characterized by the secondary low pressure side (23), the secondary high pressure side (25) and the means (5) to transfer the fluid from the secondary low pressure side to the secondary high pressure side.