The fuel tank is vented through a closed air removal system. Fuel vapors are captured by a canister of activated carbon - an absorber.
The fuel system is constantly under pressure, even after the engine has been switched off, so any work on the fuel system must be relieved of pressure.
There is no fuel return circuit in the fuel distribution line.
Pic. 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 (pic. 3.49);
- fuel filter (integrated into the fuel pump/sensor module);
- fuel return line;
- fuel pressure control;
- fuel pump immersed in the fuel tank;
- fuel distribution line;
- pressure and fuel flow valve;
- fuel return line;
- fuel line supplying fuel vapor to the engine;
- fuel supply line.
The fuel pressure regulator is built into the fuel pump/sensor module located in the fuel tank.
Fuel is supplied to the injectors at a pressure of 3.5 bar.
The fuel rail valve performs the following functions:
- relieves pressure in the distribution line;
- controls fuel pressure;
- controls fuel consumption.
The fuel filter of the pump module / fuel level sensor provides filtering 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 on any part 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 and 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 getting fuel in them. If fuel comes into contact with skin, wash the area with plenty of water.
The container in which the fuel is located contains its vapors and is potentially explosive.
Keep cleanliness when working with the power system, as dirt entering the system can interfere with the normal operation of the engine.
The idle speed is controlled by a stepper motor.