
An injector is disclosed which comprises a valve needle engageable with a seating. A spring urges the needle towards its seating, the spring engaging a spring abutment. A pressure backing member positioned within the injector is slidable relative to the spring abutment under the action of the pressure of fuel applied thereto. The pressure backing member is engageable with a surface associate with the needle to urge the needle towards its seating. The slidable pressure backing member reduces the ...











