Abstract: The present invention relates to a fuel injection system for a combustion engine. The system comprises a source of fuel, an injector and a means for delivering pressurized fuel strokes to said injector, said injector being arranged for generating at least two fuel jets with different jet parameters at closely adjacent locations and having directions such that the jets interact with each other along a surface interface therebetween so as to generate a fine spray. The jet breakup time is shortened and the droplet size is substantially reduced.