The fuel pump assembly with fuel gauge sensor is located in the fuel tank.
The fuel pump on vehicles with a gasoline engine performs the function of taking and pumping fuel to the fuel injectors. For vehicles with a diesel engine, the fuel priming pump is designed to supply fuel from the tank to the injection pump, which then pumps the fuel into the fuel rail and injectors. On vehicles with a diesel engine, a jet is also installed, designed to supply fuel from the left to the right section of the fuel tank to the fuel priming pump (see illustration 1.0).
1.0. Fuel tank with fuel priming and jet pumps:
1 - fuel priming pump plug
2 - tee
3 - fuel supply line
4 - fuel tank section with fuel priming 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 diesel engine fuel filter also has a condensate separator with a condensate level sensor.
The current fuel supply is indicated to the driver by an indicator device on the instrument panel. The fuel tank is ventilated by an exhaust ventilation system. Gasoline vapors that are harmful to the environment and are vented from the tank are captured by the adsorber and from there are sent to the engine for subsequent combustion.
Fuel economy
Driving style largely determines fuel consumption. A few tips for proper handling of the accelerator pedal:
- A) move off immediately after starting the engine, even in frosty weather;
- b) turn off the engine during stops and parking, the duration of which will be more than 40 seconds;
- V) drive in the highest possible gear;
- G) maintain a steady speed when driving long distances. Avoid high speeds. Evaluate the traffic situation to avoid unnecessary and unnecessary braking;
- d) do not carry unnecessary cargo. If the roof rack is not in use, remove it;
- e) Maintain prescribed tire pressure. Do not operate the vehicle with low tire pressure.
Rules for cleanliness and safety when working with the fuel system
When working on the fuel supply system, the following cleanliness and safety precautions must be carefully observed:
No open flames or neoplasms near the workplace! No smoking! The workplace must be equipped with a fire extinguisher!
Make sure the workplace is well ventilated. Fuel fumes are poisonous.
The fuel system is under pressure. When the system is opened, fuel may be ejected: Catch up the spilled fuel* 1 with a rag. Wear protective goggles when performing work.
The fuel hoses are fixed to the nozzles with clamping steel clamps or clamps with a clamping screw. Clamps with clamping screws should only be replaced with steel clamping clamps. For the installation of steel clamping clamps, special pliers are designed, for example, VAG1275 (see illustration 1.0a).
1.0a. Pliers VAG1275
Thoroughly clean connections and surrounding surfaces before disconnecting pipes.
Lay the removed parts on a clean lining and cover them with plastic wrap or paper. Do not use rags with pile!
Details and assemblies that have been opened or dismantled should be carefully covered or covered if further work is not carried out immediately.
Remove spare parts from the packaging just before installing them. Install only clean parts.
Do not install parts that have been stored unpackaged, such as in a tool box.
With an open fuel system, if possible, do not work with compressed air. If possible, do not move the vehicle.
Do not use silicone-based sealant. Silicone particles are sucked up by the engine, but do not burn out and can damage the lambda probe.
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