FIELD: engine engineering. SUBSTANCE: system has petrol tank 3, carburetor 4, idling passageway 27 with solenoid valve 28, source 6 of gas fuel, and gas reducer 7. Gas duct 8 is in communication with insert 22, having a homogenizer, through gas mixer 20 and pipe line 26. Mixer 20 has casing 21, air duct 15 with throttle and filter 19, and gas passageway 10 with throttle 13 and gas valve 9. Control device 12 is made up as double-positioned switch 16 whose inlet 17 is connected with the outlet of ignition lock 18. First outlet 30 of the switch is connected with the electromagnet winding 11 of gas valve 9. The second outlet is coupled with electromagnet winding 29 of valve 28. Valve 9 is detachable. EFFECT: enhanced reliability. 4 dwg
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