Fuel injection apparatus

A fuel injection apparatus for use in an internal combustion engine includes a fuel injector (10) having a valve member (12) which is operable to control injection of fuel through an injector outlet (14), a first supply path (40) having a first path length (L1) for delivering fuel to an injector control chamber (20), a second supply path (42) having a second path length (L2) for delivering fuel to an injector delivery chamber (26) and a control valve (22) for controlling fuel pressure within the injector control chamber (20) so as to control movement of the valve member (12). An actuation means (46) is arranged to vary at least one of the first (L1) and second (L2) path lengths in response to one or more injection parameters. Varying the first (L1) and/or second (L2) path length enables resonant pressure pulses within the control chamber (20) and/or delivery chamber (26) to be optimised so as to minimise the pressure differential across the valve needle (12) at the instant of closure of the control val