Checking the Vent Lines and EVAP Canister

-- Remove the bleed line -1-. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

Fig 1: Identifying Breather Line & EVAP Canister

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-- Connect the Hand Vacuum Pump VAS 6213 to the vent line to the EVAP canister as illustrated.

Fig 2: Securing Pressure Tester Kit - Adapter Set - Fitting VAS 6550/3-1

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-- Secure the Pressure Tester Kit - Adapter Set - Fitting VAS 6550/3-1 on the vent line.

-- Connect the Hand Vacuum Pump VAS 6213 and the Pressure Tester Kit - Adapter Set - Fitting VAS 6550/3-1 using a standard hose -A-.

-- Set the slide ring -1- on the Vacuum Pump VAS 6213 in position -A- for "vacuum".

Fig 3: Adjusting Hand Vacuum Pump Slide Ring

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-- Operate the Hand Vacuum Pump VAS 6213 several times. No vacuum should be built up.

If A Vacuum Forms

-- Check the vent line at the EVAP canister for contamination and clean if necessary -Item 9- in Figure.

If No Vacuum Forms

Fig 4: Identifying EVAP Canister Purge Regulator Valve 1 -N80

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-- Seal the breather hole -arrow- closed and operate the vacuum pump several times again. A vacuum must form.

If No Vacuum Forms

Fig 5: Identifying EVAP Canister And EVAP Canister Purge Regulator Valve

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-- Clamp off the hose between the EVAP canister -1- and EVAP Canister Purge Regulator Valve 1 -N80- -5-.

-- Actuate the vacuum pump again a few times.

If A Vacuum Forms

The EVAP canister and the line -3- are OK.

If No Vacuum Forms

-- Check the EVAP canister for leaks and damage and replace if necessary.

-- Check the line to the EVAP Canister Purge Regulator Valve 1 -N80- for leaks and damage.

If No Malfunction Can Be Found

Check the wire to the separating point on the underbody.

-- Release and remove the vent line -1-. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

Fig 6: Disconnecting Vent Line (White) And Supply Line (Black) At Connecting Point

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-- Seal the vent line -1- with the Sealing Tool T10249.

-- Connect the Hand Vacuum Pump VAS 6213 with the Pressure Tester Kit - Adapter Set - Hose 2 VAS 6550/3-2 to the line to the fuel tank.

Fig 7: Identifying Hand Vacuum Pump VAS 6213 And Pressure Tester Kit - Adapter Set - Hose 2 VAS 6550/3-2

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-- Operate the vacuum pump several times. A vacuum must form.

If No Vacuum Forms

-- Check the line to the fuel tank for leaks and damage.

If No Malfunction Can Be Found

-- Check the fuel tank for leaks and damage.