Pressure powered pump

Claim 1

IN COMBINATION, A FUEL CELL OF THE TYPE CONSUMING ONLY A PROTION OF FUEL FLUID RECEIVED HAVING AN INLET FOR RECEIVING FUEL FLUID AND OUTLET FOR DISCHARGING UNCONSUMED FUEL FLUID; A FLUID SOURCE DELIVERING FLUID UNDER PRESSURE; AND A PUMP CONNECTED TO THE INLET AND OUTLET OF THE FUEL CELL AND CONNECTED TO THE FLUID SOURCE COMPRISING A PUMP HOUSING FORMING A MAIN CHAMBER, A PISTON BLOCK LOCATED WITHIN THE MAIN CHAMBER, A PISTON HAVING AN INNER AND OUTER WALL LOCATED WITH THE MAIN CHAMBER TO FORM TWO OPPOSED CIRCULATION CHAMBERS BETWEEN THE OUTER WALL AND THE PUMP HOUSING, SAID PISTON ENCOMPASSING THE PISTON BLOCK TO FORM TWO OPPOSED SUPPLY CHAMBERS BETWEEN THE PISTON BLOCK AND THE INNER WALL, AND SAID PISTON MOVABLE WITHIN THE MAIN CHAMBER RELATIVE TO THE PUMP HOUSING AND THE PISTON BLOCK TO EXPAND ONE CIRCULATION CHAMBER AND ONE SUPPLY CHAMBER WHILE CONTRACTING THE OTHER CIRCULATION CHAMBER AND THE OTHER SUPPLY CHAMBER, INTAKE MEANS FOR CONNECTING THE FUEL CELL OUTLET TO THE EXPANDING CIRCULATION CHAMBER, DISCHARGE MEANS FOR CONNECTING THE FUEL CELL INLET TO THE CONTRACTING CIRCULATION CHAMBER, INLET MEANS FOR CONNECTING THE FLUID SOURCE TO THE SUPPLY CHAMBERS, OUTLET MEANS FOR CONNECTING THE FUEL CELL INLET TO THE SUPPLY CHAMBERS, VALVING MEANS HAVING A FIRST AND SECOND POSITION, SAID FIRST POSITION CONNECTING THE FLUID SOURCE TO ONE SUPPLY CHAMBER TO EFFECT MOVEMENT OF THE PISTON TO EXPAND SAID ONE SUPPLY CHAMBER WHILE CONNECTING THE FUEL CELL INLET TO THE CONTRACTING SUPPLY CHAMBER, AND SAID SECOND POSITON REVERSING THE CONNECTIONS OF THE FLUID SOURCE AND THE FUEL CELL INLET RELATIVE TO THE SUPPLY CHAMBERS TO REVERSE THE MOVEMENT OF THE PISTON, AND MEANS FOR SWITCHING THE VALVING MEANS FROM THE FIRST POSITION TO THE SECOND POSITION WHEN ONE SUPPLY CHAMBER REACHES A MINIMUM VOLUME AND FROM ITS SECOND POSITION TO ITS FIRST POSITION WHEN THE OTHER SUPPLY CHAMBER REACHES A MINIMUM VOLUME.