Audi Workshop Service and Repair Manuals > A4 Mk1 > Power unit | 4-Cylinder engine (5-valve), Mechanics | Fuel supply, gas operation | Removing and installing parts of fuel supply system | Removing and installing fuel tank with its attachments and fuel filter (vehicles with front-wheel drive)

4-Cylinder engine (5-valve), Mechanics

Removing and installing parts of fuel supply system

Removing and installing fuel tank with its attachments and fuel filter (vehicles with front-wheel drive)



Breather pipe ◆ To activated charcoal filter , Item 2 Return pipe ◆ From fuel manifold ◆ Note direction of arrow on flange 20 Nm Fuel filter ◆ Installation position: Arrow points in through-flow direction



Retaining clip ◆ For fuel filter Supply pipe ◆ To fuel manifold ◆ Note direction of arrow on flange 25 Nm Overflow hose O ring ◆ Renew Gravity valve ◆ Position => Fig. 1 ◆ To remove valve unclip upwards out of filler neck ◆ Check valve for through-flow valve vertical: open, valve tilted 45 °: closed



Rubber cup Retaining ring Seal ◆ Renew if damaged Cap Earth connection ◆ Position => Fig. 1 ◆ Ensure that connector is seated properly on metal ring of filler neck ◆ Secure the contact tab of wire with bolt for fuel filler neck -Item 20-5 ◆ After installation, use an ohmmeter to check the electrical connection between the metal ring on the fuel filler neck and a bare metal part on the body Specification: approx. 0 ω.



O rings ◆ Renew Vent valve ◆ Position => Fig. 1 ◆ Checking =>Fig.2 Fuel tank ◆ Removing and installing 25 Nm ◆ Note tightening sequence => Page 20-13 Bracket ◆ For securing straps Securing straps ◆ Removing and installing ◆ Note different lengths ◆ Note correct position

→ Fig.1 Position of gravity valve, vent valve and earth connection

‒ Route earth connection as shown in illustration.
‒ Ensure that plug connector for earth connection is properly seated on metal ring on fuel filler neck.



‒ → Secure the contact tab -1- of wire with bolt -2- for fuel filler neck. ‒ After installation, use an ohmmeter to check the electrical connection between the metal ring on the fuel filler neck and a bare metal part on the body. ‒ Specification: approx. 0 ω

→ Fig. 2 Checking vent valve

Audi Workshop Service and Repair Manuals