FUEL SYSTEM FOR A SPARK IGNITION ENGINE

A methane and hydrogen injection device is provided. The methane and hydrogen injection device includes a first methane injector, a second hydrogen injector, a single common injection pipe. The injectors are associated together so as to produce a mixture of methane and hydrogen with a variable concentration ratio, and the common injection duct is shaped to be operatively connected to an intake manifold of a spark-ignition internal combustion engine.