NOVELTY - The system (10) has a water separation device (34) fluidically coupled with an anode output line (28), of a fuel cell over a recirculation line (30) and fluidically coupled with an anode inlet line (24), where the water separation device comprises an emptying/rinsing combination valve (40) that is coupled with a cathode inlet line (16). A controller (44) operates the valve. The water separation device is not fluidically coupled with a cathode output line (18) of the fuel cell, and does not comprise a liquid water sensor (38). The anode intake is fluidically connected with an injector (26).    USE - Fuel cell system i.e. proton exchange membrane (PEM) fuel cell system, for producing desired power to drive a vehicle i.e. fuel cell vehicle.    ADVANTAGE - The system is operated in a simple manner at reduced cost by removing a special provided flush valve and a liquid water level sensor. The rinsing of gas and draining of liquid water in the cathode inlet line minimizes probability of hydrogen emissions caused due to catalytic combustion of the hydrogen gas, and minimizes complexity and cost of the system. The purging of the dilution gas frequently occurs than the emptying processes of liquid water during the operation of the fuel cell system so as to maintain the fuel gas purity, thus permitting merging of the functions of a dilution gas flush valve and a water drain valve to a single combination valve. The combination valve opens and empties the water into a sump when rinsing of dilution gas is desired, so that an amount of accumulated water and the dilution gas in the anode can be minimized.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for discharging an anode side of a fuel cell system.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic flow diagram of a fuel cell system.'(Drawing includes non-English language text)'    Fuel cell system (10)    Cathode inlet line (16)    Cathode output line (18)    Anode inlet line (24)    Injector (26)    Anode output line (28)    Recirculation line (30)    Water separation device (34)    Liquid water sensor (38)    Emptying/rinsing combination valve (40)    Controller (44)