ENGINE FUEL SUPPLY DEVICE

PROBLEM TO BE SOLVED: To provide an engine fuel supply device that changes over a liquefied gas fuel supply system between a return mode and a returnless mode, avoiding excessive temperature rise in a fuel tank by controlling return fuel to be minimized while surely avoiding the vaporization of supply fuel. SOLUTION: The engine fuel supply device comprises a first fuel return pipeline 9a branching on the way of a fuel supply pipeline and a second fuel return pipeline 9b for returning fuel, not injected by an injector 8, both of which have shut-off valves 14, 15, respectively, and are connected to a fuel tank 2. A fuel pressure sensor 52 and a fuel temperature sensor 51 are arranged in the fuel supply pipeline near the injector 8 and a fuel rail 6. An electronic control unit 50 for detecting their output signals executes control into the return mode when determining that injected fuel may be in a vaporized condition and at starting the engine and into the returnless mode during normal operation. COPYRIGHT: (C)2007,JPO&INPIT