Fuel injector

A fuel injector for use in an injector arrangement including a fuel pump having a pump chamber (21) and a spill valve arrangement (24) including a spill valve member (22) which is engageable with a spill valve seating (28a) to control communication between the pump chamber (21) and a low pressure drain. The fuel injector further comprises a valve needle (12) which is engageable with a valve needle seating, a control chamber (62) arranged such that the fuel pressure therein urges the valve needle (12) towards its seating, a control valve arrangement, including a control valve member (42), for controlling the fuel pressure within the control chamber (62), and an actuator arrangement (34) for controlling movement of the spill valve member (22) and the control valve member (42). The actuator arrangement comprises a double pole actuator (37a, 37b) having a first armature (40) which is movable with the spill valve member (22) and a single pole actuator (28) having a second armature (44) which is movable with the control valve member (42). The invention also relates to an actuator arrangement (34) comprising a double pole actuator (37a, 37b) having a first armature (40) which is movable with the spill valve member (22) of an injector and a single pole actuator (28) having a second armature (44) which is movable with the control valve member (42).