Abstract: An injector system adapted for use in a free-piston engine, includes an injection pump designed in the form of a free-piston pump and having a pump piston accommodated in a cylinder for reciprocating within the cylinder for making a compression stroke from a bottom dead center to a top dead center and for making an expansion stroke from the top dead center to the bottom dead center, an injector nozzle disposed in an engine piston or in a cylinder head which oscillates axially together with the engine piston, for injecting fuel received from the injection pump into a working chamber of the free-piston engine, a stroke limiting piston bearing on a working chamber distant end of the pump piston, and a restriction mechanism for limiting the travel of the limiting piston and the travel of the pump piston in the directions of the compression stroke and the expansion stroke.