ENGINE FUEL SYSTEM WITH VAPOR GENERATION FOR ENGINE COLD STARTING

摘要

An engine fuel system includes liquid fuel delivery for normal engine operation and fuel vapor generation for use in cold starting on fuel vapor alone. A fuel vapor generator, preferably in a vehicle fuel tank, includes a fuel vapor collector connected in a return line between a pressure regulator and an in-tank fuel pump. A charging portion includes a pump for conducting fuel vapor from the collector to the cold start canister and a return line to provide circulation of the vapor into the canister. A vapor delivery portion includes a delivery line between the cold start canister and an air inlet of an associated engine. An air inlet line delivers air to the canister during cold starting. A subsystem is formed by the fuel vapor generator connected in a circuit with the in-tank fuel pump and the pressure regulator return fuel line.