The fuel cell system and its use

A fuel cell system having a fuel cell (11) having an anode chamber (12) with a feed line (13) and an outlet (14) for a fuel and a cathode compartment (16) with a feed line (17) and an outlet (18) for comprises an oxidizing agent, further comprising a device (20) for generating / preparing a hydrogen-rich gas as fuel for the fuel cell of a fuel that has a number of reactor elements and the output side (22) to the fuel feed line (13) and the input side (21) , is connected via a fuel supply line (31) having a fuel tank (30) being for setting a certain pressure levels and / or temperature level of the fuel for the fuel cell (11) in the fuel supply line (31) at least one pressure-conveying means (32; 35) is arranged characterized in that in the fuel feed line (13) and / or in the fuel discharge pipe (14) at least one pressure regulator (40; 41) or between two or more of reactor elements (23, 24, 25, 26) are arranged in each case one or more additional pressure regulators (44, 45, 46).