Fuel injection system

An apparatus for mixing a liquid fuel with air for use with a dual fluid injection system for an internal combustion engine, the apparatus comprising an inlet for receiving a metered quantity of liquid fuel, a flow path extending from the inlet for transporting liquid fuel received at the inlet to a mixing zone at which liquid fuel is admitted into a volume of air to create an air-fuel mixture, the flow path having an inlet end communicating with the inlet and an outlet end communicating with the mixing zone, the flow path being configured to convey liquid fuel received at the inlet end and to discharge liquid fuel at the outlet end into the mixing zone, wherein the flow path is configured such that the volume of liquid fuel discharging at the outlet end corresponds to the volume of the metered quantity of liquid fuel received at the inlet, wherein the flow path is sized to retain liquid fuel therein by capillary action whereby the flow path remains substantially filled with liquid fuel between delivery cycles, and wherein the flow path comprises a directional change between the inlet end and the outlet end.

A method of fuelling an internal combustion engine, the method comprising providing a flow path having an inlet end, an outlet end and a directional change between the inlet end and outlet end, the flow path being sized to retain liquid fuel therein by capillary action whereby the flow path is configured to remain substantially filled with liquid fuel between delivery cycles, delivering a metered quantity of liquid fuel to the flow path at the inlet end, the volume of liquid fuel received at the inlet end serving to drive liquid flow along the flow path and to cause a corresponding volume of liquid fuel to issue at the outlet end of the flow path.

A method of fuelling an internal combustion engine, the method comprising transporting a metered quantity of liquid fuel around a turn section to an outlet end of a flow path sized to retain liquid fuel therein by capillary action whereby the flow path is configured to remain substantially filled with liquid fuel between delivery cycles, discharging the metered quantity of liquid fuel at the outlet end for mixing with pressurised air to create an air-fuel mixture, and delivering the air-fuel mixture into a combustion space.