The fuel tank is ventilated through a closed air removal system. Fuel vapors are captured by a canister containing activated carbon – an absorber.
The fuel system is constantly under pressure, even after the engine is turned off, so before carrying out any work on the fuel system, it is necessary to relieve the pressure.
There is no fuel return circuit in the fuel distribution line.
Figure 3.49. Elements of the fuel supply system: 1 - fuel vapor absorber; 2, 3, 4, 5 - fuel lines
The fuel supply circuit includes:
- fuel vapor absorber 1 (figure 3.49);
- fuel filter (integrated into the fuel pump/level sensor module);
- fuel return line;
- fuel pressure regulator;
- a fuel pump submerged in the fuel tank;
- fuel distribution line;
- fuel pressure and flow valve;
- fuel return line;
- fuel line for supplying fuel vapor to the engine;
- fuel supply line.
The fuel pressure regulator is integrated into the fuel pump/sensor module located in the fuel tank.
Fuel is supplied to the injectors under a pressure of 3.5 bar.
The fuel distribution valve performs the following functions:
- relieves pressure in the distribution line;
- controls fuel pressure;
- controls fuel consumption.
The fuel filter of the pump/fuel level sensor module provides filtration of harmful inclusions up to 15-20 microns.
Safety requirements and warnings
Gasoline is extremely flammable and explosive, so care must be taken when working with any components of the fuel system.
Work must be carried out in a well-ventilated area, preferably with open windows and doors to create a draft.
Do not use open flames, electric welding, or tools that may generate sparks. Make sure there is a charged fire extinguisher in the immediate vicinity of the work area.
Use goggles to protect your eyes from fuel getting into them. If fuel comes into contact with your skin, wash the area with plenty of water.
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The container containing the fuel contains its vapors and is potentially explosive.
When working with the fuel system, maintain cleanliness, as dirt entering the system can disrupt the normal operation of the engine.
The idle speed is regulated by a stepper motor.