Checking fuel system for leaks - vehicles with 2.5 ltr. 6-cylinder engine — AUDI

🧭 Before you start

Fits: Audi A4 Cabriolet B6/B7 (8H), Audi A4 B6/B7 (8E)

• Opens: fuel
• Special tools named: V.A.G 1274/11, V.A.G 1274/1A, V.A.G 1318/17, 3094

Don't miss

• Mark fuel supply pipe (1) and fuel return pipe (2).
• The hose clamps 3094 must not be applied directly to the fuel pipes themselves as this can cause damage.
• Do not attach hose clamp 3094 directly to fuel pipe - Danger of damage.

🔧 Engine codes this applies to

📋 Procedure

1. Detach caps on engine cover panel.
2. Remove engine cover panel (arrows).
3. Attach adapter V.A.G 1274/11 with adapter V.A.G 1274/1A to coolant system testerV.A.G 1274.
4. ⚠ The fuel system is pressurised. Before opening the system place a clean cloth around the connection. Then release pressure by carefully loosening the connection. — Unscrew fuel return pipe at injection pump and connect up hose of adapter V.A.G 1274/11 in its place.
5. Detach trim in luggage compartment.

6. If necessary, fold forward right backrest of rear seat bench.
7. Remove left-side section of backrest (1/3 section) 72.
8. Remove left-side trim in luggage compartment and anti-soiling tray 70.
9. Unscrew cover for flange (arrows).
10. Mark fuel supply pipe (1) and fuel return pipe (2).
11. Detach both pipes from flange (press release tabs).
12. Connect one adapter V.A.G 1318/17-1 onto fuel supply pipe and one onto fuel return pipe.
13. Clamp off adapter hoses using hose clamps 3094. [Note: The hose clamps 3094 must not be applied directly to the fuel pipes themselves as this can cause damage.]
14. Remove rear seat bench 72.
15. Detach cover for flange (left and right side) (arrows).
16. Clamp off fuel hose (right side of vehicle) using a hose clamp 3094.
17. Disconnect fuel line (arrow) from flange (left side of vehicle) by pressing release tab.
18. Connect adapter V.A.G 1318/17-1 to return pipe.
19. Clamp off adapter hose using a hose clamp 3094. [Note: Do not attach hose clamp 3094 directly to fuel pipe - Danger of damage.]
20. Use cooling system testerV.A.G 1274 to create a pressure of between 1.0 ... 1.5 bar.
21. If pressure drops constantly, locate leak and eliminate fault.

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