A method for operating a vehicle having a fuel system that may include unwanted water is described. The reactor includes a vertical tube, at least a reaction chamber located inside the vertical tube, an input flow baffle located on the at least a reaction chamber, and at least a gas exit installed on the at least a reaction chamber for exhausting the vertical input reagent gas flow and the vertical output reagent gas flow. The basic control circuit communicates signals with the specific control circuits via the communication bus so that the specific control circuits can control corresponding actuators according to the data obtained from corresponding sensors via the intermediate distributing unit.