Dual fuel system for a liquid fuel injection engine

Claim 1

IN A DUEL FUEL SYSTEM FOR A MULTI-CYLINDER ENGINE OF THE COMPRESSION IGNITION TYPE HAVING A LIQUID FUEL METERING INJECTION PUMP INCLUDING A CONTROL MEANS FOR VARYING THE AMOUNT OF FUEL CHARGE DELIVERED BY SAID PUMP TO THE CYLINDERS OF SAID ENGINE TO MAINTAIN A PREDETERMINED ENGINE SPEED REGARDLESS OF THE LOAD ON SAID ENGINE, THE IMPROVEMENT COMPRISING AN INTAKE STRUCTURE HAVING A PLURALITY OF OUTLETS FOR SUPPLYING THE INDIVIDUAL CYLINDERS OF SAID ENGINE AND HAVING AN INLET, A PLURALITY OF PASSAGEWAYS INTERCONNECTING SAID INLET AND SAID OUTLETS, CARBURETOR MEANS LOCATED IN SOME OF SAID PASSAGEWAYS, OTHERS OF SAID PASSAGEWAYS FORMING AIR BY-PASS MEANS EXTENDING FROM SAID AIR INLET TO PORTIONS OF SAID INTAKE STRUCTURE DOWNSTREAM OF SAID CARBURETOR MEANS, MIXTURE THROTTLE MEANS FOR SAID CARBURETOR MEANS, AIR THROTTLE MEANS FOR SAID BY-PASS MEANS OPERABLE TO RESTRICT THE FLOW THEREIN AND PRODUCE A VARIABLE PRESSURE DROP ACROSS SAID CARBURETOR MEANS, AND MEANS INTERCONNECTING SAID INJECTION PUMP CONTROL MEANS AND SAID MIXTURE THROTTLE MEANS TO MOVE SAID MIXTURE THROTTLE MEANS AND SAID INJECTION PUMP CONTROL MEANS IN INVERSE RELATION AND TO MOVE SAID AIR THROTTLE MEANS IN INVERSE RELATION TO SAID MIXTURE THROTTLE MEANS.