Balanced pressure pump for liquid petroleum fuel

Claim 1

A LIQUID PETROLEUM PUMP SYSTEM COMPRISING A SUPPLY TANK HAVING AN UPPER LEVEL CONNECTION AND A LOWER LEVEL CONNECTION, A CONSUMER STORAGE TANK HAVING AN UPPER LEVEL CONNECTION AND A LOWER LEVEL CONNECTION, A PUMP DEVICE INTERMEDIATE SAID TANKS AND FUEL CONECTIONS FROM SAID SUPPLY TANK THROUGH THE PUMP DEVICE TO THE STORAGE TANK ANF FROM SAID STORAGE TANK THROUGH THE PUMP DEVICE TO THE SUPPLY TANK, SAID PUMP DEVICE COMPRISING OPPOSITE HOLLOW SECTIONS, A RECIPROCATING ELEMENT BETWEEN SAID SECTIONS, ONE OF SAID SECTIONS HAVING A SUPPLY CHAMBER ON ONE SIDE OF SAID RECIPROCATING ELEMENT, AND THE OTHER OF SAID SECTIONS HAVING A DISCHARGE CHAMBER ON THE OTHER SIDE OF SAID RECIPROCATING ELEMENT, A SUPPLY PORT TO SAID SUPPLY CHAMBER HAVING AN INFLOW CHECK VALVE THEREIN, AN OUTFLOW PORT FROM SAID SUPPLY CHAMBER HAVING AN OUTFLOW CHECK VALVE THEREIN, A DISCHARGE PORT TO SAID DISCHARGE CHAMBER HAVING AN INFLOW CHECK VALVE THEREIN, AN EXHAUST PORT FROM SAID DISCHARGE CHAMBER HAVING AN OUTFLOW CHECK VALVE THEREIN, A PUMP SHAFT MEMBER EXTENDING INTO SAID DISCHARGE CHAMBER IN RECIPROCATING DRIVING RELATIONSHIP WITH SAID RECIPROCATING ELEMENT, SAID FUEL CONNECTIONS FROM THE SUPPLY TANK TO THE STORAGE TANK COMPRISING A LINE FROM THE LOWER LEVEL CONNECTION OF THE SUPPLY TANK TO THE SUPPLY PORT OF THE SUPPLY CHAMBER AND A LINE FROM THE OUTFLOW PORT OF THE SUPPLY CHAMBER TO THE LOWER LEVEL CONNECTION OF THE STORAGE TANK, SAID FUEL CONNECTIONS FROM THE STORAGE TANK TO THE SUPPLY TANK COMPRISING A LINE FROM THE UPPER LEVEL CONNECTION OF THE STORAGE TANK TO THE DISCHARGE PORT OF EXHAUST CHAMBER AND A LINE FROM THE EXHAUST PORT OF THE DISCHARGE CHAMBER TO THE UPPER LEVEL CONNECTION OF THE SUPPLY TANK, WHEREBY TO EQUALIZE PRESSURES ON OPPOSITE SIDES OF THE RECIPROCATING ELEMENT WHILE SAID RECIPROCATING ELEMENT IS RECIPROCATED BY SAID PUMP SHAFT DURING A PUMPING CYCLE.