DIRECT FUEL INJECTION SYSTEM

A direct injection fuel system is shown for injecting hydrogen fuel (F) into a gas turbine combustor. The fuel injection system comprises a plurality of fuel injector blocks (1202). Each fuel injector block includes a fuel admission duct (1301) having an inlet (1401) for receiving hydrogen fuel from a fuel supply, an outlet (1402) for delivering hydrogen fuel into the combustor and a central axis (C) extending from said inlet to said outlet. Each fuel injector block also includes an air admission duct (1302) located around the periphery of the fuel admission duct, having an inlet (1403) for receiving air from a diffuser and an outlet (1404) for delivering air (A) into the combustor for mixing with the hydrogen fuel.