Fuel Delivery and Air Induction: Service and Repair

Fuel System, Bleeding

Special tools, testers and auxiliary items required

• Adapter for K-jetronic Test Device (V.A.G 1318/20)

• Suction Pump (VAS 5226)

• Vehicle Diagnostic Tester

• If the fuel supply system was opened, it must always be bled before starting the engine.

• If the fuel supply system is not bled, the catalytic converter will be damaged.

• Pay attention to the rules of cleanliness. Refer to => [ Clean Working Conditions ] Fuel Supply.


The fuel system is under pressure!

• Always wear protective eyewear and protective clothing to prevent injuries and fuel from coming in contact with your skin.

• Before loosening line connections, place a cloth around the connection point. Then release pressure by carefully pulling off the line.

- Remove cap - arrow - from the bleed valve.






- Turn the valve on the adapter (V.A.G 1318/20) counterclockwise until it is completely open.






- Install the adapter (V.A.G 1318/20-1) onto the adapter (V.A.G 1318/20).

- Install the adapter (V.A.G 1318/20) hand tight onto the bleed valve.

- Connect the hose from the suction pump (VAS 5226) as shown.






- Turn the valve on the adapter (V.A.G 1318/20) clockwise into the bleed valve to the stop.

- Check the adapter and hose connection for leaks.

Connect the vehicle diagnostic tester as follows:

- Connect the diagnostic cable - 2 - to the Data Link Connector (DLC) in the driver's footwell.






- Press the following buttons on the display one after another:

OBD

OBD ->

Engine electronics ->

Output diagnostic test ->

- Keep pressing the -> until the fuel pump relay - J17 activates. This activates the fuel pump. Let the diagnostic run until fuel without bubbles runs out of the bleed valve. Then end the output diagnostic test mode.

• If the output diagnostic test mode is interrupted, the engine must be started for a short time before the mode can be accessed again. The output diagnostic test mode is automatically cancelled after 60 seconds.

- Turn the valve on the adapter (V.A.G 1318/20) counterclockwise until it is completely open again.






- Clamp the hose from the suction pump (VAS 5226) (for example, using hose clamps up to 25 mm dia. (3094)) and disconnect the hose from the adapter (V.A.G 1318/20-1).

- Remove the adapter (V.A.G 1318/20) from the bleed valve.

- Install the cap - arrow - onto the bleed valve.