Fuel Tank Bleeding, Checking Without Fuel Tank Leak Detection

Special tools and workshop equipment required 

• Hand Vacuum Pump:VAS6213 
• Engine Bung Set:VAS6122 
• Pressure Tester Kit:VAS6550 
• Pressure Tester Kit - Adapter Set - Fitting:VAS6550/3-1 
• Pressure Tester Kit - Adapter Set - Hose 2:VAS6550/3-2 
• Vehicle Diagnostic Tester

-- Check the DTC memory using the Vehicle Diagnostic Tester.

-- Switch off the ignition.

Check the EVAP Canister Purge Regulator Valve 1 -N80- for Leaks.

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-- Release and remove the breather line -2-. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, DISCONNECTING .

-- Connect the :VAS6213  to line leading to the EVAP Canister Purge Regulator Valve 1 -N80- using the :VAS6550/3-1  and a commercially available hose.

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-- Set the slide ring -1- on the :VAS6213  in position -B- for "pressure".

Fig 1: Adjusting Hand Vacuum Pump Slide Ring

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-- Create approximately 0.1 bar (1.45 psi) pressure using the :VAS6213  .

• If the pressure >>cannot<< be built:

-- Check the line to the EVAP Canister Purge Regulator Valve 1 -N80- for leaks and damage. If no error was detected, then the EVAP Canister Purge Regulator Valve 1 -N80- is leaking. Replace the EVAP Canister Purge Regulator Valve 1 -N80-.

• If the pressure can be built:

The EVAP Canister Purge Regulator Valve 1 -N80- is not leaking.

Vent Hose on EVAP Canister, Checking

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-- Release and remove the breather line -2-. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, DISCONNECTING .

-- Connect the :VAS6213  with the :VAS6550/3-2  to the EVAP canister line.

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

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-- Remove the right rear wheel housing liner. Refer to OVERVIEW - REAR WHEEL HOUSING LINER .

-- Remove the breather line -3- at connection -T- from the EVAP canister and seal the connection on the EVAP canister with suitable service equipment. 

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-- Set the slide ring -1- on the :VAS6213  in position -B- for "pressure".

Fig 3: Adjusting Hand Vacuum Pump Slide Ring

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-- Squeeze the :VAS6213  approximately 25 times.

• If >>no<< pressure can be built:

-- The vent connection is OK.

• If pressure can be built:
  Fig 4: Connection Diagram on EVAP Canister

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-- The vent connection -A- on the EVAP canister is blocked. Remove the vent cap -4- and check the vent connection for debris.

EVAP Canister and Breather Line, Checking for Leaks

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-- Release and remove the breather line -2-. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, DISCONNECTING .

-- Connect the :VAS6213  with the :VAS6550/3-2  to the EVAP canister line.

Fig 5: Identifying Hand Vacuum Pump VAS 6213 And Pressure Tester Kit - Adapter Set - Hose 2 VAS 6550/3-2

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-- Remove the right rear wheel housing liner. Refer to OVERVIEW - REAR WHEEL HOUSING LINER .

-- Remove the breather line -3- at connection -T- from the EVAP canister and seal the connection on the EVAP canister with suitable service equipment.

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-- Remove the vent cap from the connection -A- and seal the connection to the EVAP canister -2- with a suitable plug -1- from the :VAS6122  .

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-- Set the slide ring -1- on the :VAS6213  in position -B- for "pressure".

Fig 6: Adjusting Hand Vacuum Pump Slide Ring

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-- Create approximately 0.1 bar (1.45 psi) pressure using the :VAS6213  .

• If the pressure can be built:

-- The EVAP canister and the breather line are not leaking.

• If the pressure >>cannot<< be built:
  Fig 7: Connection Diagram on EVAP Canister

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The EVAP canister or the breather line is leaking. First check the EVAP canister for leaks as follows:

1 -  The vent connection -A- is sealed.

2 -  Connection -T- is sealed.

-- Connect the :VAS6213  to the connection -M- on the EVAP canister -1- using a commercially available hose -3-.

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-- Create approximately 0.1 bar (1.45 psi) pressure using the :VAS6213  .

• If pressure >>cannot<< be built, then the EVAP canister is leaking. Determine leaks by listening, feeling or using leak detection spray.
• If pressure can be built, then the EVAP canister is not leaking. Check the breather line.