Checking tandem pump: Audi A6 C5 (AFB, AFN, AJM, AKE, …)
Step-by-step checking tandem pump for the Audi A6 C5: 14 steps. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A6 C5 (4B)
- Renewed: tandem pump, seal
Don't miss
- Tandem pump is shown with engine removed for illustration purposes.
- After removing pressure gauge, tighten plug to 25 Nm. Always renew seal.
🔧 Engine codes this applies to
📐 60 workshop diagrams for AFB
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Pull dipstick (1) out of guide tube.
- Unclip cover caps.
- Unscrew nuts (arrows) and detach engine cover panel.
- Remove insulation beneath cover.
- Re-insert dipstick in guide tube.
- ⚠ 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.]
- Connect tandem pump testerVAS 5187 as shown in the illustration.
- Start engine.
- Increase engine speed to 1500 rpm.
- Read the pressure on the gauge:
- Clamp off fuel return hose between fuel filter and tandem pump using hose clamp.
- Increase engine speed to 1500 rpm.
- Read the pressure on the gauge:
- Renew tandem pump . [Note: After removing pressure gauge, tighten plug to 25 Nm. Always renew seal.]
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.