FUEL CELL SYSTEM

The invention relates to a fuel cell system () comprising at least one fuel cell stack () having an anode section () and a cathode section (), an ejector (), a fuel mixture line () for conveying a fuel mixture—containing primary fuel and secondary fuel—from the ejector () to the anode section (), a primary fuel line () for supplying the primary fuel to the ejector (), and a recirculation line () for returning the secondary fuel from the anode section () to the ejector (), wherein at least sections of the primary fuel line () extend through a heat exchange volume () within the recirculation line () for a heat-transmitting connection between the secondary fuel and the primary fuel.