Fuel injector

The present invention relates to a fuel injector (10) for use in a fuel system of an internal combustion engine. The fuel injector (10) has a supply passage (24) for high pressure fuel and an injection nozzle (25). The injection nozzle (25) includes a valve needle (26) which can engage with a valve needle seating (28) to control fuel delivery from the fuel injector (10). A first control valve (48) is provided for controlling fuel pressure within a control chamber (42) to control the valve needle (26). The fuel injector also includes a second control valve (78) for controlling fuel pressure within a low pressure drain (21). The invention also relates to a control valve (78) for controlling fuel pressure within a low pressure drain (21).