Table of contents: Fuel economy ↓ Cleanliness and safety rules when… ↓
The fuel system includes the fuel tank, fuel lines, fuel filter, and fuel pump.
The fuel pump assembly with the fuel gauge sensor is located in the fuel tank.
The fuel pump in cars with a gasoline engine performs the function of collecting and pumping fuel to the fuel injectors. In cars with a diesel engine, the fuel pump is designed to supply fuel from the tank to the high-pressure fuel pump, which then pumps the incoming fuel into the fuel rail and injectors. On cars with a diesel engine, a jet pump is also installed, designed to supply fuel from the left to the right section of the fuel tank to the fuel pump (see illustration 1.0).
1.0. Fuel tank with fuel priming and jet pumps:
1 - fuel pump plug
2 - tee
3 - fuel supply line
4 - fuel tank section with fuel pump
5 - fuel supply line
6 - jet pump
7 - fuel supply line
8 - connecting tee
The fuel filter is designed to clean the fuel from possible contaminants. The fuel filter of diesel engines also has a condensate separator with a condensate level sensor.
The current fuel level is indicated to the driver by an indicator device on the instrument panel. The fuel tank is ventilated by an exhaust ventilation system. Harmful gasoline vapors, removed from the tank by the ventilation, are captured by the adsorber and from there sent to the engine for subsequent combustion.
Fuel economy
Driving style largely determines fuel consumption. Here are some tips on how to use the accelerator pedal correctly:
- a) move off immediately after starting the engine, even in frosty weather;
- b) turn off the engine when stopping or parking for more than 40 seconds;
- c) drive in the highest possible gear;
- d) Maintain a steady speed when driving long distances. Avoid high speeds. Assess the road conditions to avoid unnecessary and unnecessary braking;
- d) Do not carry unnecessary cargo. If the roof rack is not in use, remove it;
- e) Maintain the prescribed tire pressure. Do not operate the vehicle with low tire pressure.
Cleanliness and safety rules when working with the fuel system
When working with the fuel supply system, the following cleanliness rules and safety precautions must be carefully observed:
No open fire or new growth near the workplace! No smoking! The workplace must be equipped with a fire extinguisher!
Ensure good ventilation of the work area. Fuel fumes are toxic.
The fuel system is under pressure. Opening the system may cause fuel to escape: Collect any leaking fuel* 1 with a rag. Wear safety glasses when performing work.
Fuel hoses are secured to the pipes with steel clamps or clamps with a clamping screw. Replace clamps with a clamping screw only with steel clamping clamps. Special pliers are used to install steel clamping clamps, for example, VAG1275 (see illustration 1.0a).
1.0a. VAG1275 pliers
Before disconnecting pipes, thoroughly clean the connection points and nearby surfaces.
Place the removed parts on a clean lining and cover them with plastic film or paper. Do not use rags with lint!
Carefully cover or close off parts and assemblies that have been exposed or dismantled if further work is not to be carried out immediately.
Remove spare parts from packaging immediately before installation. Install only clean parts.
Do not install parts that have been stored without packaging, such as in a toolbox.
If possible, do not work with compressed air when the fuel system is open. If possible, do not move the vehicle.
Do not use silicone-based sealant. Silicone particles are sucked into the engine but do not burn and can damage the lambda probe.
(The original material is located on the website «audimanual»)