The book discusses special issues related to the conversion of passenger cars and light-duty trucks equipped with gasoline or diesel internal combustion engines to gas fuel. The feasibility of switching to gas fuel is substantiated. Particular attention is paid to modern gas cylinder devices from different manufacturers, intended for the conversion of carburetor, diesel engines and engines equipped with an injection system and an electronic control unit. Describes: the principle of operation, design features, operating rules and maintenance conditions for various gas equipment systems. The book is addressed to a wide range of motorists.