Abstract: A connector is disclosed which is intended for use with an injector. The connector comprises a projection defining an inlet passage sealed, in use, within a bore provided in the injector. The inlet passage communicates with at least one outlet passage. The connector further comprises at least one tooth received within a recess provided in the injector to secure the connector to the injector. The recess is conveniently defined by a body and nut forming part of the injector.

Abstract: A fuel injector comprising a nozzle body, a bore provided in the nozzle body within which a valve needle is slidable, the valve needle and the bore being shaped to include a guide region where the valve needle and the bore are of substantially identical diameter, the engagement between the valve needle and the bore in the guide region serving to guide the valve needle for sliding movement within the bore, wherein the fuel injector includes a collar extending around part of the nozzle body, the collar engaging the nozzle body to restrict dilation of the bore in at least part of the guide region.

Abstract: A mounting arrangement for mounting a component, for example a fuel injector, in a desired position comprises a sleeve which surrounds part of the component and includes a screw-threaded end region. At a point spaced from the first end, the sleeve defines a groove arranged to receive a resilient member which cooperates, in use, with a groove provided in the component to secure the component to the sleeve.

Abstract: A fuel injection nozzle is disclosed which comprises a value needle slidable within a bore and biased by a spring into engagement with a seating of conical form wherein the valve needle includes an upstream conical region of cone angle slightly larger than the seating and a downstream conical region of cone angle slightly smaller than the seating, and an annular groove provided between the upstream and downstream regions wherein an upstream edge of the groove forms with the upstream region a seating line along which the valve needle engages the seating when the valve needle is in its closed position.

Abstract: A fuel system is disclosed which comprises a fuel pump, a spill valve and an injector provided in a single unit. The injector includes a valve member biased towards a seating by a coiled compression spring. The spring is engaged between a spring abutment of the valve member and a piston. The piston is arranged such that the face thereof facing away from the spring has fuel applied thereto when the spill valve is opened in order to assist movement of the valve member into engagement with the seating.