Vehicle fuel system Volkswagen Passat B3

General information about the power system
The power system includes a fuel tank, fuel lines, fuel filter, fuel pump, carburetor or injection system, air filter. The fuel tank is located behind the rear seat. The driver...

Carburetor adjustment
Each carburetor is tested and adjusted at the factory. This setting should not be changed. Very high fuel consumption and insufficient engine power are most often due to other...

Fuel supply problems with a carburetor
In case of violations of the fuel supply, check the system in the following sequence: Check if there is fuel in the tank. Disconnect the fuel hose between the fuel pump and the...

Accuracy when working with fuel supply systems
When working on fuel supply systems, the following cleanliness rules must be carefully observed: Thoroughly clean the connection points and places near these connections before...

Carburetor device 2E3
1 - bolt, 7 Nm 2 - fitting for connecting the inlet fuel line 3 - safety bracket 4 - gas thrust 5 - temperature indicator sensor 6 - carburetor 2EZ 7 - thermal switch of the...

Removal and installation of the carburetor
Removing Disconnect ground wire from battery. Unscrew the fastening of the intake air guide casing and put it aside together with the connected wires, see below . Mark vacuum hose...

Check / adjust idling and CO content
Warm up the engine to operating temperature, engine oil temperature should be at least +60°C. Turn off all electrical consumers. If available, then the air conditioning system....

Throttle adjustment
Attention: Throttle thrust is very sensitive to buckling, so it must be handled with great care during installation. One slight buckling can later lead to breakage while driving....

Checking the automatic device for enriching the combustible mixture at start-up
Prerequisite for checking: the engine must be cold, the coolant temperature is below +55°C. Turn on the ignition. Check the voltage supply to the device: Disconnect the plug,...

Removal and installation of an automatic device for enriching the combustible mixture at start-up
The automatic device for enriching the combustible mixture at start-up has electric and water heating. Electric heating is turned off by a thermal switch when the coolant...

Checking and adjusting the idle speed of the crankshaft of a cold engine
The throttle valve clearance can also be adjusted by means of the idle speed of the cold engine. The advantage of this method is that the carburetor does not need to be removed to...

Checking the thermo-pneumostatic valve
The vacuum in the distributor's ignition timing controller is controlled by a thermo-pneumostatic valve. This means that when the engine is cold (at temperatures below about...

Checking the fuel cut-off valve
When the ignition is turned off, the fuel cut-off valve closes the supply of the idling combustible mixture and the econostat emulsion to the mixing chamber. This prevents the...

Checking and adjusting the performance of the accelerator pump
It is necessary to check the performance of the accelerator pump in the case when it has too high gas consumption, poor transient when pressing the gas pedal, the engine does not...

Vacuum limiter test (Pulldown)
The vacuum limiter in the carburetor serves to overcome the force of the bimetallic spring and slightly open the air damper when the gas pedal is pressed at the moment when the...

Thermovalve test with time delay
Remove thermostatic valve -1- and fit auxiliary hose -2- onto it. Cool the thermostatic valve to a temperature below 0°C. Blow the thermal valve through the hose -2- with your...

Checking the intake manifold heating system
2E3 carburetor and Mono-Jetronic system To improve the dynamic properties during engine warm-up, an electric heater is installed in the intake manifold. The heater heats up in a...

Removal and installation of the direct casing of inlet air
When working on a carburetor, it is enough to unscrew the intake air guide casing from the carburetor and, with the wires connected, put it aside. The intake air temperature...

Checking the intake air heating
2EZ carburetor and Mono-Jetronic system The intake air heating is controlled by an air damper in the air filter box depending on the load and temperature. The air damper is...

Removal and installation of the fuel pump
The fuel pump is located on the side of the engine block and is driven from the intermediate shaft. Caution: If the fuel pump diaphragm is worn, this will result in poor fuel...

Removal and installation of the fuel level sensor
Engine with carburetor or injection system The fuel level sensor is located at the top of the fuel tank. It consists of a float and a potentiometer. When the fuel level drops, the...

Air filter replacement
Replace the air filter element every 30,000 km. If the dust content is high, replace the filter element more frequently. Release 4 quick release clips (arrows) and remove the air...

Fuel filter replacement
The full flow fuel filter is located in the engine compartment and should be replaced every 30,000 km as part of the service. Removing Disconnect ground wire from battery....

Carburetor Troubleshooting
The prerequisites for finding faults in accordance with the table below are the perfect adjustment and operation of the engine, the ignition system and all additional units, as...

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