Vehicles with 4-cylinder engine (unit injector) — AUDI

🧭 Before you start

Fits: Audi A6 C5 (4B)

• Special tools named: V.A.G 1274/1A, VAS 5187
• Renewed: seal

Don't miss

• Tandem pump is shown with engine removed for illustration purposes.
• After removing pressure gauge, tighten plug to 25 Nm.Renew seal.

🔧 Engine codes this applies to

📋 Procedure

1. Pull dipstick (1) out of guide tube.
2. Unclip cover caps.
3. Unscrew nuts (arrows) and detach engine cover panel.
4. Remove insulation beneath cover.
5. Re-insert dipstick in guide tube.

6. ⚠ The fuel system is pressurised. Before opening the system place a clean cloth around the connection. Then release pressure by carefully loosening the connection.In extreme cases the fuel lines and the fuel can reach a temperature of 100 °C on vehicles with unit injector engine. Allow the fuel to cool down before disconnecting the lines - danger of scalding.Wear protective gloves.Wear safety goggles. — Remove screw plug (arrow). [Note: Tandem pump is shown with engine removed for illustration purposes.]
7. Secure adapter for testing diesel fuelV.A.G 1274/2 with adapter V.A.G 1274/1A to cooling system testerV.A.G 1274.
8. Connect adapter for testing diesel fuelV.A.G 1274/2 to tandem pump using banjo bolt from VAS 5187.
9. Remove luggage compartment floor lining.
10. If necessary, fold forward right backrest of rear seat bench.
11. Remove left-side section of backrest (1/3 section) 72.
12. Remove left-side trim in luggage compartment and luggage compartment floor trim 70.
13. Unscrew cover for flange (arrows).
14. Unplug electrical connector at flange if necessary.
15. Fit hose clamps up to 25 mm3094 to fuel supply pipe (2) and to fuel return pipe (1).
16. Use cooling system testerV.A.G 1274 to create a pressure of between 1.0 ... 1.5 bar.
17. If pressure drops constantly, locate leak and eliminate fault. [Note: After removing pressure gauge, tighten plug to 25 Nm.Renew seal.]

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