NOVELTY - The combiner (5) of a recycled gas fraction and the feedstock (A, B, C) flowing to the reformer (3), includes a constriction.    USE - A gas generator and reformer producing hydrogen-containing gas for a vehicle fuel cell. To produce a hydrogen-containing gas from liquid hydrocarbons and/or hydrocarbon derivatives, especially petrol or diesel, to operate a fuel cell. The fuel cell is used in a drive system for transportation on land, water or in the air. The fuel cell is an auxiliary energy generator. It is used in conjunction with an internal combustion engine for the foregoing purposes (all claimed).    ADVANTAGE - Use of energy for recycling is minimized. Management of water content in educts supplied to the reformer, and the hydrogen yield, are optimized. Use of a jet pump obviates all need for a compressor. Kinetic energy in gas flow to the reformer is quite sufficient for this duty. At the same time as balancing the pressures, this arrangement has no moving parts, a considerable advantage, especially in view of the high temperatures and aggressive materials handled. These advantages are obtained at the relatively small cost of increasing the precompression of educts supplied.    DETAILED DESCRIPTION - The combiner is a gas jet pump. At least some of the recycled gas originates between reformer and equipment enriching the hydrogen-containing gas with further hydrogen. All recycled gas flow originates directly after the reformer. Before recycling some of the hydrogen-rich gas, it is passed through a unit constructed to reduce the hydrogen concentration. This unit is the anode chamber (7) of a fuel cell (2). The recycled gas flow fraction is from the anode chamber (7) of the fuel cell (2), following hydrogen consumption. The reformer is a steam reformer; it is an autothermal reformer    DESCRIPTION OF DRAWING(S) - A block schematic diagram of an implementation is presented.    gas generator (1)    fuel cell (2)    reformer (3)    combiner (5)    anode chamber (7)