Volkswagen Workshop Service and Repair Manuals

Bleeding fuel system   Note t  To avoid damage to catalytic converter, fuel system without return line must be bled following work on fuel lines, or fuel filter. Do not start the engine until the fuel system has been bled. t  Observe rules for cleanliness → Chapter. Special tools and workshop equipment required

t  Diesel extractor -VAS 5226-

t  Adapter -V.A.G 1318/20-   WARNING The fuel system is pressurised! Wear eye protection and protective clothing to avoid possible injury and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection. –  Unscrew protective cap → Item from bleeder valve → Item.

–  Turn valve on T-piece -arrow- anti-clockwise until it is entirely open. –  Screw adapter -V.A.G 1318/20–1- onto adapter -V.A.G 1318/20-. –  Now, screw assembled adapter -V.A.G 1318/20- hand-tight onto bleeder valve.

–  Connect hose of diesel extractor -VAS 5226- as illustrated. –  Screw valve (on T-piece) clockwise to stop into bleed valve. –  Check adapter and hose connections for leaks.   Note t  Function of fuel pump is checked using final control diagnosis. t  The engine must be run briefly before the final control diagnosis can be called up a second time.

–  Connect vehicle diagnosis tester as follows: –  Push diagnosis cable connector onto diagnosis connection in driver footwell. –  Switch on ignition. –  Press buttons on display one after the other for Vehicle self-diagnosis, Self-diagnosis, Engine electronics and Final control diagnosis. –  Press right arrow button on display ► until fuel pump relay -J17- is activated. The fuel pump is now activated. –  Terminate final control diagnosis and switch off ignition once fuel flows from breather valve without bubbles.

–  Turn valve on T-piece -arrow- anti-clockwise until it is entirely open again. –  Clamp off hose from diesel extractor -VAS 5226- (e.g. using hose clips up to Ø 25 mm -3094- and pull it off adapter -V.A.G 1318/20–1-. –  Unscrew adapter -V.A.G 1318/20- from bleed valve. –  Screw protective cap → Item onto bleeder valve again.