VW Golf manuals

Volkswagen Golf Service & Repair Manual: Connection diagram - activated charcoal filter

Fuel tank leak detection takes advantage of the fact that a vacuum develops naturally in the fuel system as the fuel in the tank cools. The variables temperature and pressure are necessary for fuel tank leak detection. The temperature sensor is integrated into the control unit for fuel tank leak detection -J909-. The tank pressure sensor -G400- is fitted in the pressure control valve. The system is deemed leak-free if 2.5 mbar vacuum is measured as the tank temperature drops. If no vacuum develops, there is a leak in the fuel system, and an entry will be made in the event memory of the engine control unit.

Connection diagram - activated charcoal filter

1 -  Activated charcoal filter
Fitting location: In rear right wheel housing beneath liner
Removing and installing → Chapter.
2 -  Air filter
3 -  Pressure regulating valve
With tank pressure sensor -G400-
4 -  Breather line
From activated charcoal filter to engine
5 -  Cap
The gasket must not be dirty or damaged
6 -  Control unit for fuel tank leak detection -J909-
With temperature sensor
7 -  Fuel supply line
8 -  Breather line
9 -  Activated charcoal filter solenoid valve 1 -N80-
Checking → Vehicle diagnostic tester
Activated charcoal filter with fuel tank leak detection

Assembly overview - activated charcoal filter system
1 -  Connecting hose From air filter to pressure control valve 2 -  Hose clips 3 -  Pressure regulating v ...

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