FIELD: mechanical engineering; engines. SUBSTANCE: system has circuit to feed liquid fuel to carburetor and gas fuel feed circuit with gas reservoir, gas pressure regulator, gas line with shutoff valve and automatic gas feed regulator operated by depression in intake manifold. Housing 16 of regulator has union 17 to supply gas and unions 7 and 8 with channels communicating with air cleaner and spool-type depression builder. Chamber of regulator housing 16 is divided by diaphragm 24 into spaces one of which communicates with atmosphere through hole 26. Installed in other space is metering valve with seat and spring-loaded shutoff member 19 secured on rod 21. Adjusting needles 23 are fitted in channels of unions 7 and 8. Rod 21 has tappet 25 secured on diaphragm 24. One end of spring 22 is connected with rod 21, the other end, with regulator housing 16. Seat 18 of metering valve arranged at side of union 17 is provided with hole to pass rod 21. Seating surface of seat 18 is conical. EFFECT: enhanced operation reliability. 2 dwg
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