Fuel injection system i.e. common rail fuel injection system, for internal-combustion engine of motor vehicle, has prefeed pump for conveying fuel from tank to interior part of fuel high-pressure pump that is designed as plug-in pump

摘要

The system has a prefeed pump (110) for conveying fuel from a tank (100) to an interior part (35) of a fuel high-pressure pump (120), where leakage quantities of the high-pressure pump are discharged into the interior part of the high-pressure pump. An amount of fuel required for lubrication of bearings (42, 44) of the high-pressure fuel pump is discharged to suction sides of the prefeed pump. The fuel high-pressure pump is designed as a plug-in pump, and the prefeed pump is driven by the fuel high-pressure pump. An independent claim is also included for a radial piston pump.