Fuel Tank Bleeding, Checking, Vehicles Without Fuel Tank Leak Detection

Special tools and workshop equipment required

Hand Vacuum Pump:VAS 6213

Fig 1: Hand Vacuum Pump VAS 6213
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Pressure Tester Kit:VAS 6550

Fig 2: Identifying Pressure Tester Kit VAS 6550
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Engine Bung Set:VAS 6122

Fig 3: Engine Bung Set
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Oil Filler - Adapter:VAS 6262A/8

-- 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 .

Vehicles with small cable diameter:

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-- Connect the Hand Vacuum Pump:VAS 6213 to the line leading to the EVAP Canister Purge Regulator Valve 1 -N80- using the Pressure Tester Kit - Adapter Set - Fitting:VAS 6550/3-1 and a commercially available hose.

Vehicles with large cable diameter:

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-- Connect to the Filler - Adapter:VAS 6262A/8 -A- to the cable for the EVAP Canister Purge Regulator Valve 1 -N80- -1-.

-- Connect a suitable, commercially available hose -C- to the Filler - Adapter:VAS 6262A/8 -A-.

-- Connect the Pressure Tester Kit - Adapter Set - Fitting:VAS 6550/3-1 -B- to the commercially available hose -C-.

-- Connect the Hand Vacuum Pump:VAS 6213 with the Pressure Tester Kit - Adapter Set - Hose 2:VAS 6550/3-2 to the Pressure Tester Kit - Adapter Set - Fitting:VAS 6550/3-1 -B-.

Continuation for All Vehicles:

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-- Set the slide ring -1- of the Hand Vacuum Pump:VAS 6213 -2- to position -B- for "pressure".

-- Create approximately 0.1 bar (1.45 psi) pressure using the Hand Vacuum Pump:VAS 6213 .

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 .

Vehicles with small cable diameter:

Fig 4: Identifying Hand Vacuum Pump VAS 6213 And Pressure Tester Kit - Adapter Set - Hose 2 VAS 6550/3-2

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

Vehicles with large cable diameter:

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-- Connect a suitable, commercially available hose -D- to the hose leading to the EVAP canister -1-.

-- Connect the Oil Filler - Adapter:VAS 6262A/8 -A- to a commercially available hose -D-.

-- Connect the Oil Filler - Adapter:VAS 6262A/8 -A- with a suitable, commercially available hose -C- to the Pressure Tester Kit - Adapter Set - Fitting:VAS 6550/3-1 -B-.

-- Connect the Hand Vacuum Pump:VAS 6213 with the Pressure Tester Kit - Adapter Set - Hose 2:VAS 6550/3-2 to the Pressure Tester Kit - Adapter Set - Fitting:VAS 6550/3-1 -B-.

Continuation for All Vehicles:

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

-- Remove the breather line -4- at the connection -arrow T- from the EVAP canister. Close the connection to the EVAP canister with suitable service equipment.

Fig 5: Exploded View Of EVAP System

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-- For this, use the Engine Bung Set:VAS 6122 .

-- Set the slide ring -1- of the Hand Vacuum Pump:VAS 6213 -2- to position -B- for "pressure".

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-- Squeeze the Hand Vacuum Pump:VAS 6213 approximately 25 times.

If >>no<< pressure can be built:

-- The vent connection is OK.

If pressure can be built, the vent connection -A- at the EVAP canister is blocked.

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-- Remove the vent cap -1- and check the vent connection for debris. Refer to OVERVIEW - EVAP SYSTEM .

EVAP Canister and Breather Line, Checking for Leaks

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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 Engine Bung Set:VAS 6122 .

Conditions:

The connection >>T<< at the EVAP canister is still closed.

-- Set the slide ring -1- of the Hand Vacuum Pump:VAS 6213 -2- to position -B- for "pressure".

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-- Create approximately 0.1 bar (1.45 psi) pressure using the Hand Vacuum Pump:VAS 6213 .

If the pressure can be built:

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

If the pressure >>cannot<< be built:

Fig 6: Exploded View Of EVAP System
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The EVAP canister or the breather line is leaking. First check the EVAP canister for leaks as follows:

The vent connection -arrow A- is sealed.
Connection -arrow T- is sealed.

-- Remove the breather line -3- from the connection -arrow M-.

-- Connect the Hand Vacuum Pump:VAS 6213 with a commercially available hose on the connection -arrow M-.

NOTE:

The installation position of the connection -M- is different depending on the EVAP canister.

-- Create approximately 0.1 bar (1.45 psi) pressure using the Hand Vacuum Pump:VAS 6213 .

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.