Figure 39. Fuel tank and fuel lines:
1 - fine oil filter; 2 - fuel supply hose to the fuel pump; 3 - fuel pump; 4 - check valves; 5 - fuel drain hose from the carburetor; 6 - carburetor; 7 - fuel drain pipe; 8 - fuel supply pipe from the tank; 9 - fuel level sensor; 10 - separator; 11 - separator mounting bracket; 12 - Fuel tank cap; 13 - separator hose; 14 - filling pipe; 15 - filler pipe hose; 16 - fuel tank. 17 - tank mounting clamp.
Fuel supply — with a return drain of part of the fuel from the carburetor through a calibrated hole in the carburetor pipe with a diameter of 0.7 mm back into the fuel tank. The performance of the fuel pump, which supplies fuel from the tank to the carburetor, exceeds the engine's fuel needs. Constant circulation of fuel in the system removes air locks and improves the reliability of fuel supply. Fuel tank 16 additionally plays the role of an engine refrigerator.
The drain hose is equipped with a check valve 4, which prevents fuel from draining from the tank through the carburetor when the vehicle overturns.
The fuel tank is connected by hose 13 to separator 10, which serves to condense gasoline vapors. To prevent fuel from leaking out of the tank through the separator, a double-acting check valve is installed on the second hose of the separator. The valve works in both directions: as fuel is consumed from the tank, it lets atmospheric air into the tank, and when the pressure in the tank increases, it releases fuel vapors from the tank.
Air is supplied through a thermostat, air filter, carburetor, from which air as part of the combustible mixture enters the engine cylinders through the intake manifold. Exhaust gases are emitted into the atmosphere through the exhaust manifold, intake pipe, additional and main mufflers.
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