Patent ID: 8348176

Claim:
A fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, comprising: an injection valve member having a nozzle needle for opening and closing at least one injection opening; a pressure-boosting device with which fuel at system pressure is compressed to injection pressure; a first control valve and a second control valve, the first control valve controlling a control chamber of the nozzle needle, the second control valve controlling a differential pressure chamber of the pressure-boosting device; a housing, in which the injection valve member, the pressure boosting device, the first control valve, and the second control valve, are disposed; a high-pressure connection provided for delivering the fuel; a first return flow connection provided for diverting a control quantity from the pressure-boosting device; a second return flow connection provided for diverting a control quantity from a control chamber of the nozzle needle, wherein the first return flow connection and the second return flow connection are disposed on different housing parts of the housing; wherein the first control valve has a first low-pressure chamber which communicates with a first chamber via a hydraulic connecting line, and a bore of the first return flow connection communicates with the first chamber; and wherein a leak fuel chamber associated with said second control valve communicates hydraulically with the first low-pressure chamber of the first control valve via hydraulic connecting lines extending through the housing.