PURPOSE: To keep off a sudden change in a combustion sate, by making a feed mode of two types of fuel into careful arrangement in time of fuel selection, in case of an engine using low-vaporing liquid fuel of kerosene or the like as the main fuel and gas fuel as starting fuel, respectively.
CONSTITUTION: A carburetor 16 installed in an engine 1 driving a heat pump mixes low vaporing liquid fuel of kerosene or the like to be fed out of a main fuel feed passage B with gas fuel of town gas or the like to be fed out of a starting fuel feed passage C, and feeds the engine 1 with this mixture. In this case, a solenoid valve 9 or an on-off valve is interposingly installed in the main fuel feed passage B. In addition, a flow regulating mechanism 13, which is constituted of installing a solenoid valve 10 in a main feed passage and a solenoid valve 11 and an orifice 12 in a bypass passage respectively, is interposingly installed in the starting fuel feed passage C. And, after engine starting by gas fuel alone, first the solenoid valve 9 is fully opened, then the gas fuel is throttled down by the flow regulating mechanism 13 for decrement feed and, after the elapse of the specified time,gas fuel feed is controlled so as to be cut off.
KIMOTO SEIJI
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