as the control hydraulic fluid though it should be appreciated that engine oil transmission power steering brake coolant or some other suitable engine fluid might be used fuel injector 16 is controlled in operation by a control valve assembly 60 preferably attached to and located within the injector itself control valve assembly 60 has an electrical actuator 20 that is preferably a solenoid it should be appreciated however that another suitable device such as a piezoelectric actuator might be used solenoid 64 has a coil 66 and an armature 67 which is attached to a control valve member 62 an electrical connector 21 connects solenoid 64 with the control module 22 a biasing spring 65 biases armature 67 and solenoid 64 toward their upward position closing low pressure seat 70 control valve member 62 has been shown as a poppet valve though it should be appreciated that another suitable valve type such as a spool might be used control valve member 62 is movable within injector body 50 between an upward off position in which it closes low pressure seat 70 and a downward on position in which it closes high pressure seat 71 when solenoid 64 is de energized and control valve member 62 is in its upward position closing low pressure seat 70 control volume 69 provides fluid communication between pressure communication passage 56 and needle check control chamber 57 the high pressure fluid supplied to needle control chamber 57 exerts a downward force on closing hydraulic surface 85 of piston 84 when solenoid 64 is energized and control valve member 62.