A fuel supply arrangement for a fuel cell system comprising: - a fuel provision port for connection to a fuel storage reservoir for storing fuel and a fuel supply port for connection to a fuel cell assembly for generating electrical energy, - a fuel supply duct for supplying fuel from the fuel storage reservoir to the fuel cell assembly, which is arranged between the fuel provision port and the fuel supply port, - a fuel circulation duct connected to the fuel supply duct to re - turn unconsumed fuel from the fuel cell assembly to the fuel supply duct, - a passive jet nozzle assembly disposed in the fuel supply duct and configured to suck unconsumed fuel from the fuel circulation duct making use of negative flow pressure, and to mix the unconsumed fuel into the fuel supply duct for supply to the fuel cell assembly, - a bypass duct connected to the fuel supply duct in parallel to the jet nozzle assembly for bypassing the jet nozzle assembly in the fuel supply duct, - a pressure monitoring device disposed in the fuel supply duct between the fuel provision port and the jet nozzle assembly and configured to monitor a pressure in the fuel supply duct and to output at least one output signal (191, 192) when the pressure drops below a specific pressure value, - an activation device (17, 31) connected to the pressure monitoring device and configured to activate the bypass duct in response to the at least one output signal of the pressure monitoring device to bypass the jet nozzle assembly for supplying fuel to the fuel cell assembly, and - a fuel pump connected to the fuel circulation duct and connec - ted in parallel to the jet nozzle assembly between the fuel circulation duct and the fuel supply port to suck unconsumed fuel from the fuel circulation duct and to mix the unconsumed fuel into the fuel supply duct for supply to the fuel cell assembly, - wherein the fuel pump is connected to the pressure monitoring device and is configured to be operated in a pumping mode, in particu - lar to be activated for the pumping mode, in response to the at least one output signal of the pressure monitoring device. - a fuel provision port for connection to a fuel storage reservoir for storing fuel and a fuel supply port for connection to a fuel cell assembly for generating electrical energy, - a fuel supply duct for supplying fuel from the fuel storage reservoir to the fuel cell assembly, which is arranged between the fuel provision port and the fuel supply port, - a fuel circulation duct connected to the fuel supply duct to re - turn unconsumed fuel from the fuel cell assembly to the fuel supply duct, - a passive jet nozzle assembly disposed in the fuel supply duct and configured to suck unconsumed fuel from the fuel circulation duct making use of negative flow pressure, and to mix the unconsumed fuel into the fuel supply duct for supply to the fuel cell assembly, - a bypass duct connected to the fuel supply duct in parallel to the jet nozzle assembly for bypassing the jet nozzle assembly in the fuel supply duct, - a pressure monitoring device disposed in the fuel supply duct between the fuel provision port and the jet nozzle assembly and configured to monitor a pressure in the fuel supply duct and to output at least one output signal (191, 192) when the pressure drops below a specific pressure value, - an activation device (17, 31) connected to the pressure monitoring device and configured to activate the bypass duct in response to the at least one output signal of the pressure monitoring device to bypass the jet nozzle assembly for supplying fuel to the fuel cell assembly, and - a fuel pump connected to the fuel circulation duct and connec - ted in parallel to the jet nozzle assembly between the fuel circulation duct and the fuel supply port to suck unconsumed fuel from the fuel circulation duct and to mix the unconsumed fuel into the fuel supply duct for supply to the fuel cell assembly, - wherein the fuel pump is connected to the pressure monitoring device and is configured to be operated in a pumping mode, in particu - lar to be activated for the pumping mode, in response to the at least one output signal of the pressure monitoring device.