METHOD AND SYSTEM FOR GASEOUS AND LIQUID FUEL INJECTION

Methods and systems are provided for injecting liquid and gaseous fuel, such as propane, to an engine. In one example, under a first condition, liquid fuel from a bottom of a fuel tank is injected; under a second condition, liquid fuel from a the bottom of the fuel tank is vaporized and injected to the engine as vaporized liquid fuel; and under a third condition, gaseous fuel from a top of the fuel tank is injected to the engine.