A modular direct methanol fuel cell system includes a housing having a pump for supplying fuel from a fuel tank to a fuel cell stack and a system controller for electronically controlling the modular direct methanol fuel cell system. An integrated processor is contained in the housing, the integrated processor integrating a water condenser and a gas/liquid stream separator. A first fluid connection unit is between the fuel cell stack and the integrated processor for feeding air and fuel exiting from the fuel cell stack to the integrated processor. A second fluid connection unit is between the fuel cell stack and the integrated processor for feeding a fuel mixture from the integrated processor to the fuel cell stack. The direct methanol fuel cell system also includes a third fluid connection unit for feeding pure fuel from the fuel tank to the integrated processor.
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