Primer attachment for intake manifold

Claim 1

AN INTERNAL COMBUSTION ENGINE OF THE TYPE HAVING AN INTAKE MANIFOLD WITH A FUEL AND AIR MIXING MEANS CONNECTED THERETO AND SUPPLYING A FIRST COMBUSTIBLE FUEL MIXTURE AND AN ATTACHMENT CONNECTED TO SAID MANIFOLD AND SUPPLYING THERETO A SECOND ENRICHED COMBUSTIBLE FUEL MIXTURE, SAID ATTACHMENT INCLUDING A SOURCE OF A SECOND FUEL UNDER PRESSURE, A CONDUIT MEANS CONNECTED TO SAID SOURCE AND TO SAID INTAKE MANIFOLD, A PRESSURE REDUCTION VALVE ASSEMBLY IN SAID CONDUIT MEANS DISPOSED BETWEEN AND CONNECTING SAID SECOND FUEL SOURCE TO SAID INTAKE MANIFOLD, PREHEATING MEANS DISPOSED IN SAID CONDUIT MEANS AND BETWEEN SAID PRESSURE REDUCTION VALVE ASSEMBLY AND SAID INTAKE MANIFOLD AND APPLYING HEAT TO SAID SECOND FUEL PRIOR TO ITS INTRODUCTION INTO SAID INTAKE MANIFOLD TO COMPENSATE FOR THE TEMPERATURE REDUCTION OF SAID SECOND FUEL DURING ITS PASSAGE THROUGH SAID PRESSURE REDUCTION VALVE ASSEMBLY, A CONTROL VALVE DISPOSED IN SAID CONDUIT MEANS AND REGULATING THE FLOW OF SAID SECOND FUEL INTO SAID INTAKE MANIFOLD AND FUEL CONTROL MEANS CONNECTED TO SAID CONTROL VALVE.