Fuel feed system for internal combustion engines

Claim 1

A FUEL FEED SYSTEM FOR AN INTERNAL COMBUSTTION ENGINE, SAID SYSTEM INCLUDING AN UNVENTED FUEL SUPPLY TANK ADAPTED TO CONTAIN LIQUID FUEL, A CHARGE FORMING DEVICE CONNECTED WITH THE ENGINE HAVING A MIXING PASSAGE FORMED THEREIN, A FUEL INLET VALVE IN THE CHARGE FORMING DEVICE, MEANS BIASING THE INLET VALVE TOWARD CLOSED POSITION, A DIAPHRAGM IN THE CAHRGE FORMING DEVICE ACTUATED BY ASPIRATION IN THE MIXING PASSAGE ARRANGED TO CONTROL THE OPENING OF THE INLET VALVE, A FUEL CONVEYING TUBE CONNECTING THE CHARGE FORMING DEVICE WITH THE FUEL SUPPLY TANK FOR DELIVERING FUEL TO A REGION ADJACENT THE FUEL INLET VALVE, FUEL INTAKE MEANS TO DISPOSED IN THE FUEL SUPPLY TANK FOR FOLLOWING MOVEMENT OF THE FUEL IN THE FUEL SUPPLY TANK AND TO CARRY FUEL FROM THE FUEL SUPPLY TANK TO THE FUEL CONVEYING TUBE IRRESPECTIVE OF THE ATTITUDE OF THE FUEL SUPPLY TANK, TUBULAR MEANS CONNECTING THE FUEL SUPPLY TANK WITH A SOURCE OF VARYING FLUID PRESSURE ESTABLISHED WITHIN THE CRANKCASE OF THE INTERNAL COMBUSTION ENGINE FOR PRESSURIZING THE FUEL SUPPLY TANK, AND CHECK VALVE MEANS ASSOCIATED WITH THE TUBULAR MEANS FOR MAINTAINING FLUID PRESSURE IN SAID FUEL SUPPLY TANK DURING OPERATION OF THE ENGINE.