Removing and installing fuel tank: Audi Q3 (ACV, AFB, AFN, AGK, …)

🧭 Before you start

Fits: Audi Q3 (8U, 2011–2018); platform code 84

• Opens: fuel
• Renewed: seals

Don't miss

• Risk of accident caused by weight of fuel tankFuel tank must be empty when it is removed. — Drain fuel tank .
• The illustration shows the installation position for rest-of-world/NAR vehicles; other versions are similar.
• Seal off opening of fuel filler neck with a clean plug to prevent dirt from entering.
• For illustration purposes the fuel tank is shown without the engine and gearbox jack.
• Renew seals.When plugging in electrical connectors, make sure they engage correctly.

🔧 Engine codes this applies to

📐 20 workshop diagrams for ACV

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Observe safety precautions .
2. Observe rules for cleanliness .
3. Move front seats all the way forwards.
4. ⚠ To prevent irreparable damage to the electronic components when disconnecting the battery:Observe notes on procedure for disconnecting the battery. — Disconnect earth wire from battery terminal Electrical system27Battery; Disconnecting and connecting battery.
5. Remove rear seat bench General body repairs, interior72Rear seats; Removing and installing seat bench/individual seats.

6. ⚠ Risk of accident caused by weight of fuel tankFuel tank must be empty when it is removed. — Drain fuel tank .
7. Unclip cover (1) for flange (right-side) at retainers (arrows) using removal wedge3409.
8. Release retainer catch and unplug electrical connector (1) on flange (right-side). [Note: The illustration shows the installation position for rest-of-world/NAR vehicles; other versions are similar.]
9. Unplug electrical connector (1) for fuel pump control unit J538.
10. To do so, feel for retainer catch (arrow) with your finger and hook assembly tool T10118 into retainer catch.
11. Pull assembly tool T10118 until retainer catch is released.
12. Unplug electrical connector at fuel pump control unit J538.
13. Unclip cover (1) for flange (left-side) at retainers (arrows) using removal wedge3409.
14. Release retainer catch and unplug electrical connector (1) on flange (left-side).
15. Release retainer catch and unplug electrical connector (2) (if fitted).
16. Open tank flap.
17. Clean area around fuel filler neck.
18. Remove filler cap (2) for fuel filler neck.
19. Disengage rubber sleeve (3) from fuel filler neck (1). [Note: Seal off opening of fuel filler neck with a clean plug to prevent dirt from entering.]
20. Remove rear wheel housing liner (right-side) General body repairs, exterior66Wheel housing liners; Removing and installing wheel housing liner (rear).
21. Disconnect breather lines (1 and 2) at activated charcoal filter. Disconnecting plug-in connectors
22. Disconnect breather lines (1 and 3) at activated charcoal filter. Disconnecting plug-in connectors
23. Detach leak diagnosis line (2) at diagnostic pump.
24. Remove bolts (1) and (2) for fuel filler neck.
25. Disengage electrical wire (1) for rear right speed sensor G44 from bracket on filler neck.
26. Disconnect breather line (2). Disconnecting plug-in connectors
27. Remove rear section of exhaust system 26Exhaust pipes/silencer; Exploded view - silencer.
28. Remove underbody trim panels (rear left and right) General body repairs, exterior66Underbody trim; Removing and installing underbody trim.
29. ⚠ Risk of injury - fuel system operates under high pressure.To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection. — Disconnect fuel line (1) and breather line (2). Disconnecting plug-in connectors
30. Disconnect leak diagnosis line (3). Disconnecting plug-in connectors
31. Disconnect breather line (1) leading to activated charcoal filter solenoid valve 1N80. Disconnecting plug-in connectors
32. Disconnect fuel line (2) at fuel filter. Disconnecting plug-in connectors
33. Remove propshaft 39Propshaft; Removing and installing propshaft.
34. Release retainer catch and unplug electrical connector (1) for Haldex coupling.
35. Position engine and gearbox jack under vehicle to support tank, as shown in illustration.
36. In addition, a 2nd mechanic will be required to support the fuel tank at the rear by hand.
37. ⚠ Risk of accident caused by weight of fuel tankFuel tank must be empty when it is removed. — Remove bolts (1 ... 5). [Note: For illustration purposes the fuel tank is shown without the engine and gearbox jack.]
38. Carefully lower fuel tank with engine and gearbox jack.
39. At the same time, pull out breather line (1) for fuel filler neck inwards through body (arrows).
40. Take breather line out of retainer at connection piece (2) and disconnect breather line. Disconnecting plug-in connectors
41. Detach breather line.
42. Remove fuel tank downwards (turning it sideways as required).
43. In addition, a 2nd mechanic will be required to guide fuel filler neck out past trailing arm out by hand. [Note: Renew seals.When plugging in electrical connectors, make sure they engage correctly.]
44. Check earth wire for traces of oxidation at connectors; remove any oxidation if necessary.
45. Check that the following connectors are securely seated:
46. ⚠ Risk of explosion caused by electrostatic discharge.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 — Check that fuel line and breather line are clipped onto fuel tank.
47. Position fuel tank with securing straps on underside of vehicle using engine and gearbox jack.
48. When installing fuel tank, make sure that fuel filler neck is correctly inserted into opening on body.
49. Tighten bolts (1 ... 5).
50. Guide breather line (3) for fuel filler neck through body and attach it with new seals to pipe connector (1) on fuel tank (arrow), making sure it engages audibly.
51. Connect breather line to fuel filler neck (2) so it engages audibly.
52. Press breather line in again and then pull to check that plug-in connector is correctly engaged.
53. Remove underbody trim panels (rear, both sides) General body repairs, exterior66Underbody trim; Exploded view - underbody trim.
54. Install propshaft 39Propshaft; Removing and installing propshaft.
55. Install rear section of exhaust system 26Exhaust pipes/silencer; Exploded view - silencer.
56. Install rear right wheel housing liner General body repairs, exterior66Wheel housing liners; Exploded view - wheel housing liner (rear).
57. Install rear seat bench General body repairs, interior72Rear seats; Removing and installing seat bench/individual seats.
58. Connect battery and perform steps required after re-connecting battery Electrical system27Battery; Disconnecting and connecting battery.
59. After installing a new or completely drained fuel tank, the tank must be filled with at least 5 litres of fuel before starting the engine. [Note: The fuel pump must not be allowed to run in an empty fuel tank.]

Other AUDI procedures

• Checking glow plugs · 2 torque figures
• Checking exhaust gas recirculation and air mass meter function
• Checking intake manifold pressure sender G71 – Audi A8 D2
• Checking accelerator position sender G79
• Draining and filling with coolant – Audi 2.5 TDI · 1 torque figures
• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures