NOVELTY - A fuel cell system which uses liquid fuel as fuel to generate electric power, comprises: a fuel cell stack (11) generating electric power by chemical reaction between liquid fuel supplied to an anode and oxidant gases supplied to a cathode; and gas exhaust unit (25) discharging to an outside of the system exhaust gases discharged from the anode of the stack. The gas exhaust unit discharges the exhausted gases into liquid in a tank storing the liquid fuel or water, followed by discharging the exhaust gases to the outside of the system from the tank.    USE - As a fuel cell system which uses liquid fuel as fuel to generate electric power (claimed).    ADVANTAGE - The present fuel cell system does not need a filter thus suppresses a decrease in system efficiency of a fuel cell, and at the same time allows an emission amount of harmful materials to be reduced for an extended period of time.    DETAILED DESCRIPTION - A fuel cell system which uses liquid fuel as fuel to generate electric power, comprises: a fuel cell stack (11) generating electric power by chemical reaction between liquid fuel supplied to an anode and oxidant gases supplied to a cathode; and gas exhaust unit (25) discharging to an outside of the system exhaust gases discharged from the anode of the stack. The gas exhaust unit discharges the exhausted gases into liquid in a tank storing the liquid fuel or water, followed by discharging the exhaust gases to the outside of the system from the tank. The fuel cell system further includes fuel tank (12) storing the liquid fuel to be supplied to the stack; a water recovery section recovering water from the exhaust gases discharged from the cathode of the fuel cell stack, where the water recovered by the water recovery section is supplied to water tank (21); and a heat insulating material between the fuel cell stack and the water tank.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of a direct methanol fuel cell system.    Stack (11)    Fuel tank (12)    Fuel pump (13)    Blower (16)    Cooler (19)    Water recovery tank (21)    Water supply pump (22)    Monitor/control circuit (29)    Gas exhaust port (25)    Water level sensor (30)    Methanol concentration sensor (31)