Abstract: A fuel injector for use in an injector arrangement includes a fuel pump having a pump chamber and a spill valve controlling communication between pump chamber and a low pressure reservoir. The injector includes a valve needle which is engageable with a valve needle seating, a control chamber arranged such that the fuel pressure therein urges the valve needle towards the valve needle seating. A control valve is provided for controlling the fuel pressure within the control chamber. An actuator arrangement is arranged to control the operation of the control valve such that, when the actuator arrangement is de-energised, the control valve permits communication between the control chamber and the low pressure reservoir.

Abstract: A fuel injector comprising a valve needle biased by a spring into engagement with a seating, a surface associated with the valve needle being exposed to fuel pressure within a control chamber and restricted communication structure providing a restricted flow path between a supply passage and the control chamber. The fuel injector further comprises a drain valve controlling communication between the supply passage and a low pressure reservoir and an injection control valve controlling communication between the control chamber and the low pressure reservoir, the drain valve and the injection control valve being moveable under the control of a single electromagnetic actuator including an armature common to both valves.