Abstract

The invention relates to a method for forming a fuel-air mixture and to a fuel supply device for an internal combustion engine, having an intake manifold, into which an air intake tube with an aspirated air metering device disposed in it discharges and to which the intake tubes leading to individual combustion chambers are connected. A plurality of fuel injection valves are provided, each of which is assigned to one combustion chamber, and having a central fuel vaporizer to which fuel can be supplied by means of a fuel metering device. To form a fuel-air mixture, the fuel to be supplied to the engine is vaporized and the fuel vapor is supplied to the aspirated air. In order to lower pollutant emissions after starting during the warmup phase of the engine, vaporization of the fuel is done at relatively low temperatures, so that the fuel vapor produced essentially comprises only highly volatile fuel components. The fuel vapor produced by the fuel vaporizer in a vaporization region is supplied, downstream of the aspirated air metering device to the air aspirated by the combustion chambers in order to form a fuel-air mixture.