Checking tandem pump - vehicles with 1.9 ltr. and 2.0 ltr. 2V engine — AUDI

🧭 Before you start

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

• Renewed: o-rings at unit injectors, tandem pump, seal

Don't miss

• Illustration shows tandem pump with engine removed from vehicle.
• After removing pressure gauge, tighten plug to 25 Nm. Always 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. Unplug electrical connector (1).
7. Remove bolt (2).
8. Remove air pipe (arrows).
9. ⚠ 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: Illustration shows tandem pump with engine removed from vehicle.]
10. Connect tandem pump tester VAS 5187 as shown in the illustration.
11. Start engine.
12. Increase engine speed to 4000 rpm.
13. Read the pressure on the gauge:
14. Clamp off return hose between fuel filter and tandem pump using hose clamp.
15. Increase engine speed to 4000 rpm.
16. Read the pressure on the gauge:
17. Renew O-rings at unit injectors.
18. Renew tandem pump (see the separate procedure). [Note: After removing pressure gauge, tighten plug to 25 Nm. Always renew seal.]

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