Fuel supply system and injector for a spark ignition engine

The system has a blow-in valve (9) to which fuel and combustion gas are fed for direct input into a combustion chamber (4) in a cylinder (2) and at least one further fuel dosing device (7) in an induction channel (6) for forming a fuel/gas mixture that is separately fed to the combustion chamber as a combustion gas. The blow-in valve is a piston/cylinder unit with a piston element movable in a valve housing and bounding a blow-in chamber with a connected blow-in nozzle for mixture delivery, whereby the piston element forms a control element for a slot control for enabling the feed of fuel and combustion gas into the blow-in valve. An independent claim is also included for the following: (a) a blow-in valve for an externally ignited internal combustion engine.