LOW-PRESSURE CIRCUIT FOR A FUEL INJECTION SYSTEM AND FUEL INJECTION SYSTEM

摘要

The invention relates to a low-pressure circuit for a fuel injection system, in particular a common-rail injection system, comprising a fuel tank (1) and a prefeed pump (2) by means of which fuel can be drawn out of the fuel tank (1) and can be fed to a high-pressure pump (4) via a fuel line (3). According to the invention, the volume and pressure are controlled by a metering unit (5) disposed outside of the high-pressure pump (4) and/or by the prefeed pump (2) designed at least in said case as a regulated electric fuel pump (2'), wherein the lubrication and/or cooling of the high-pressure pump (4) is ensured by means of a throttle (8) connected in parallel to an inlet (6) of a pump element (7) of the high-pressure pump (4). The invention further relates to a fuel injection system having such a low-pressure circuit.