Checking fuel system for leaks: Audi R8 (ACK, AFB, AGA, AGE, …)

🧭 Before you start

Fits: Audi R8 (4S, 2015–)

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• If specified values are obtained, VAS 6615A is OK and check can be performed.If specified values are not obtained, VAS 6615A is defective and must be renewed.

🔧 Engine codes this applies to

📐 28 workshop diagrams for ACK

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

📋 Procedure

1. Connect tank leak tester (Audi R8)VAS 6615A to compressed air (6 ... 10 bar) (item 1).
2. Open cut-off valve (2) (handle should point in direction of flow).
3. Read off value indicated on display of tester:
4. Close adapter cut-off valve (handle should point perpendicular to direction of flow). [Note: If specified values are obtained, VAS 6615A is OK and check can be performed.If specified values are not obtained, VAS 6615A is defective and must be renewed.]
5. ⚠ If value displayed on VAS 6615A exceeds 200 mbar during the function check or during the subsequent pressure test, the device is defective and must be disconnected from the compressed-air connection immediately. — Remove engine cover panel (left-side) 10Engine cover panel; Removing and installing engine cover panel.

6. Press release tabs and detach breather hose (2) leading to fuel tank from connection (1) for activated charcoal filter.
7. Fit adapterVAS 6615A/2 to connection for activated charcoal filter and connect to tank leak tester (Audi R8)VAS 6615A.
8. Close adapter cut-off valve (5) (handle should point perpendicular to direction of flow).
9. Open cut-off valve (4) (handle should point in direction of flow).
10. After waiting approx. 5 minutes, check pressure in fuel tank; to do so, close cut-off valve (4) (handle should be perpendicular to direction of flow).
11. Read off value indicated on display of tester:
12. After waiting approx. 2 minutes, check pressure in fuel tank again; to do so, read off value displayed on tester:
13. If specification is not attained, use leak-detecting spray to locate leak and seal off. Repeat leak test.
14. If specification is attained, open cut-off valve (5) to divert remaining pressure in fuel system to activated charcoal filter.
15. Disconnect tank leak tester (Audi R8)VAS 6615A from compressed-air connection and remove from fuel tank.

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