Liquid fuel injectors

A liquid fuel injector of the kind which in use, is intended to be mounted on an internal combustion engine at a position to direct fuel into a combustion space of the engine, the injector comprising an elongated body part having a liquid fuel inlet at or adjacent one end thereof and an outlet orifice at or adjacent the other end, a valve member slidably mounted within a bore defined in the body part, resilient means acting on the valve member to urge the valve member into contact with a seating thereby to prevent flow of fuel through said orifice, a surface defined on the valve member and against which fuel under pressure can act to lift the valve member from the seating thereby to allow fuel flow through the orifice, an outlet for fuel leaking between the valve member and the bore, said outlet breaking out onto the periphery of the body part at a position adjacent said fuel inlet, a collar surrounding the body part and defining with the body part a cavity into which fuel can flow from said outlet, said collar having formed integrally therewith a nipple or nipples in which is formed a flow passage or flow passages in communication with said cavity, a circlip engageable within a groove within the body part to hold the collar in assembly with the body part, and a pair of sealing means to prevent the escape of fuel from the cavity other than through said flow passage or passages.