A first fuel rail of an engine connects to first fuel injectors and a second fuel rail connects to second fuel injectors. The first fuel injectors each includes a tip portion projecting through an opening in the cylinder head into the combustion chamber. The second fuel injectors each includes a tip portion projecting through an opening in a bottom portion of an intake port. The first fuel rail includes first mounting brackets each including an aperture, and outwardly projecting mounting bosses, and fixedly attaches to the cylinder head via fasteners that pass through the apertures of the first mounting brackets and attach to the mounting bosses of the cylinder head. The second fuel rail includes second mounting brackets each including an aperture. The second fuel rail fixedly attaches to the first fuel rail via fasteners that attach to the mounting bosses of the first fuel rail.