Fuel System, Filling and Bleeding

Fuel System, Filling and 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, Testing, and Information System (VAS 5051 B)

• 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 ] Clean Working Conditions.

Procedure


The fuel supply line is under pressure. Always wear protective eyewear and protective clothing to prevent injuries and fuel from coming in contact with your skin. Before loosening the fuel lines, place a cloth around the connection point. Remove the hose connection carefully to release the pressure.

- Remove the cap - arrow - for the bleed valve.






- Turn the valve on the T-piece counterclockwise until it is completely open.






- Install adapter (V.A.G 1318/20-1) onto the adapter for K-jetronic test device (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 (at the T-piece) clockwise into the bleed valve until seated.

- Check the adapter and hose connections for leaks.

Connect the vehicle diagnostic tester as follows:

- Connect the diagnostic cable connector - 2 - to the diagnostic connection inside the drivers foot well.






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

OBD

OBD ->

Engine electronics ->

Output diagnostic test ->

- Press the arrow button -> repeatedly until the fuel pump relay (J17) is activated. This activates the fuel pump. Let the diagnosis run until fuel flows out of the bleed valve without bubbles. 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 at the T-piece counterclockwise until it is completely open again.






- Clamp off the hose on the suction pump (VAS 5226) using a hose clamp up to 25 mm dia. (3094) and disconnect it from the adapter (V.A.G 1318/20-1).

- Remove the adapter for K-jetronic test device (V.A.G 1318/20) from the bleed valve.

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