Fuel System, Checking For Leaks: Notes

Special tools and workshop equipment required

Evaporative Emissions tester KLI 9210
Adapter for EVAP. tester KLI 9210/55-1
Vehicle Diagnostic Tester
Hose Clamps Up to 25 mm Dia. 3094

The connectors for the fuel, vacuum and ventilation lines are color coded. There is either a colored dot on the connector or the release button is the corresponding color.

Connector	Color Code on Connector/Release Button
Fuel supply	Black
Fuel return	Blue
Ventilation	White, Beige
Vacuum	Green

Conditions

The leak detection pump detected a leak.
Perform "Guided Fault Finding" using the vehicle diagnostic tester.

Evaporative Emissions tester KLI 9210 Preparation

NOTE:

Depending on the version, the appearance of the evaporative emissions tester KLI 9210 may vary.

-- Check the evaporative emissions tester KLI 9210 to determine whether there is enough fluid in the smoke generator.

-- Set valve -D- to "Hold".

Fig 1: Identifying Evaporative Emission (EVAP) Canister Purge Regulator Components

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Open the nitrogen bottle -H-.

-- Connect the measuring hose -G- to the self-test connection -B-.

-- Set valve -D- to "Test".

-- Using the pressure reducer -J-, adjust the pressure to 10 in. H2O (25 mbar).

-- Set valve -D- to "Hold".

-- The pressure must now be maintained a minimum of 2 minutes. If the pressure is not maintained, check the tester.