Fuel system of carburetor engines: 1 - fuel pump; 2 - fine fuel filter; 3 - carburetor; 4 - air filter housing; 5 - lid; 6 - air filter element; 7 - intake manifold; 8 - intake manifold gasket; 9 - intake manifold flap housing; 10 - damper housing gasket; 11 - electromagnetic valve for controlling the intake manifold flaps at fast idle speed.