Hydraulically-actuated fuel injector system having separate internal actuating fluid and fuel passages

An engine member adapted for an internal combustion engine having a plurality of hydraulically-actuated fuel injectors wherein each injector includes an actuating fluid inlet passage and a fuel inlet passage, said engine member comprising:

• a plurality of injector bores, each bore adapted to receive a respective one of the injectors;
• means for supplying hydraulically actuating fluid to each injector bore, said hydraulically actuating fluid supplying means including an actuating fluid manifold associated with the engine member, said actuating fluid manifold having a common rail passage adapted to communicate with the actuating fluid inlet passage of each injector;
• and
• means for supplying fuel to each injector bore, said fuel supplying means including a fuel manifold associated with the engine member and adapted to communicate with the fuel inlet passage of each injector, said hydraulically actuating fluid supplying means adapted to be sealed from fluid communication with the fuel supplying means, wherein each injector bore defines an annulus adapted to be in fluid communication with the actuating fluid inlet passage of the respective injector, said common rail passage extending through the engine member, said actuating fluid manifold further including a rail branch passage communicating between the common rail passage and the annulus.