Checking pressure retention valve in fuel return line (engine codes BTR and CCFA) — AUDI

🧭 Before you start

Fits: Audi Q7 (4L, 2005–2015)

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• Always read rules for cleanliness and instructions for working on fuel system .Follow these instructions before starting work and while working on the fuel system. — Remove engine cover panel .
• Clean return line connection of cylinder 1 (e.g. with commercial cleaning solution etc.) before removing.
• Take care to keep all components clean. No dirt must be allowed to get into the disconnected return line or the open connection on the injector.
• Lubricate all seals with engine oil or assembly oil before installing.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Always read rules for cleanliness and instructions for working on fuel system .Follow these instructions before starting work and while working on the fuel system. — Remove engine cover panel .
2. Clean return line connection of cylinder 1 (e.g. with commercial cleaning solution etc.) before removing.
3. Dry return line connection on cylinder 1.
4. Cover return line connection on cylinder 1 with a cloth.
5. Detach return line connection from cylinder 1. To do so, press both tabs down and at the same time pull centre piece up to release connection (arrow). [Note: Take care to keep all components clean. No dirt must be allowed to get into the disconnected return line or the open connection on the injector.]

6. Fit tester for fuel return systemVAS 6330 between return line connection and fuel return line.
7. Start engine.
8. Check pressure indicated on tester.
9. Check O-ring for fuel return line connection for damage and deformation. [Note: Lubricate all seals with engine oil or assembly oil before installing.]
10. Push return line connections carefully over seals and onto injectors. The catch should engage audibly. Then press release pin down carefully.

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