Fuel System, Checking for Leaks

Fig 1: Connecting Adapter For Evaporative Emission Tester KLI 9210/55-1 To Ventilation Line

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-- Connect the Evaporative Emissions Tester - Adapter 55 KLI 9210/55-1 to the vent lines -A- "white markings" as shown.

-- Connect the measuring hose -G- on the Evaporative Emissions Tester KLI 9210 to the Evaporative Emissions Tester - Adapter 55 KLI 9210/55-1.

Fig 2: Connecting Measuring Hose From Evaporative Emissions Tester KLI 9210 To Adapter For Evaporative Emission Tester KLI 9210/55-1

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the Vehicle Diagnostic Tester to the vehicle.

Fig 3: Connecting Evaporative Emissions Tester To Vehicle

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The procedure changed when the electrical Leak Detection Pump -V144- was introduced.

-- Switch the ignition on.

• The engine may be not running.

-- Select the Guided Functions  operating mode on the Vehicle Diagnostic Tester.

-- Select the Check Tank Ventilation System for Leaks  .

-- Start the test.

-- Watch the pressure gauge on the Evaporative Emissions Tester KLI 9210.

• The Leak Detection Pump - V144- must pump the fuel system pressure up to at least 25 mbar (25.40 cm. H2O).

The Minimum Pressure Is Not Reached and the Pressure Reached Decreases Immediately:

-- Clamp off the hose to the EVAP Canister Purge Regulator Valve 1 -N80- with a hose clamp -arrow-.

Fig 4: Clamping Off Hose To EVAP Canister Purge Regulator Valve 1 -N80-

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-- Repeat the test. If the minimum pressure is now reached: Replace EVAP Canister Purge Regulator Valve 1 -N80-.

The Minimum Pressure Is Not Reached Again Or the Pressure Reached Decreases Immediately:

-- There is a leak in the fuel system: Perform the test "Check for Leak In Fuel System". Refer to Fuel System Leak Test .