A hydraulically actuated fuel injector includes an injector body having at least one actuation fluid inlet, WATER POWER CONTROL VALVEa needle control chamber, a nozzle chamber, and a nozzle outlet that opens to the nozzle chamber. A hydraulic means within the injector pressurizes fuel in the nozzle chamber. The hydraulic means includes an actuation fluid control valve having a first solenoid and is moveable between an open position in which the actuation fluid inlet is open and a closed position in which the actuation fluid inlet is closed.Needle Valves A needle valve member is positioned to reciprocate in the nozzle chamber between an open position in which the nozzle outlet is open and a closed position in which the nozzle outlet is closed. A needle valve member includes a closing hydraulic surface exposed to pressure in the needle control chamber.Check Valves A needle control valve having a second solenoid is mounted within the injector body and is moveable between an off position in which the needle control chamber is opened to a source of high pressure fluid and an on position in which the needle control chamber is opened to a low pressure passage.

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