Checking fuel pump delivery rate (front-wheel drive): Audi TT Mk2 (BPY, BUB, BWA, CBRA, …)

🧭 Before you start

Remove the rear seat bench and right-hand side trim, unclip the flange cover and unplug the pump connector. Wire up the remote control and test leads, taping off the unused adapter contact. Release pressure carefully and disconnect the fuel line, then fit the pressure tester with adapters and a test hose into a measuring container. Build up pressure by closing the cut-off valve, leave the valve set, empty the container and run the pump for 15 seconds. Compare the delivery with the chart, then reconnect and refit the trim and seat.

Fits: Audi TT Mk2 (8J, 2006–2014)

• Opens: fuel
• Special tools named: V.A.G 1348, V.A.G 1348/3, V.A.G 1318/17

Don't miss

• Tape off the second contact of adapter cable V.A.G 1348/3-3 to prevent short circuits.
• Wrap a cloth around the connection and release pressure carefully before disconnecting the fuel line.
• Once pressure is set, do not move the cut-off valve again.
• Run the pump for exactly 15 seconds and compare against the minimum delivery chart.
• Pump voltage while running is approx. 2 volts below battery voltage; factor this into the reading.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📋 Procedure

1. Remove rear seat bench General body repairs, interior72Rear seats; Removing and installing seat bench/individual seats.
2. Remove back panel side trim (right-side) General body repairs, interior70Passenger compartment trim panels; Overview of fitting locations - passenger compartment trim panels.
3. Unclip retaining tabs (arrows) for flange cover.
4. Unplug electrical connector (arrow) at flange.
5. Connect remote controlV.A.G 1348/3A for V.A.G 1348 to contact (1) using adapter cable V.A.G 1348/3-3 and test lead from auxiliary measuring setV.A.G 1594C.

6. Tape off 2nd connector contact of adapter cable V.A.G 1348/3-3 with insulating tape (arrow) to prevent short circuits.
7. Connect contact (5) to the body (earth) using a test lead from auxiliary measuring setV.A.G 1594C.
8. Connect crocodile clip to battery "“+”" (positive terminal in engine compartment).
9. Remove filler cap from fuel filler neck.
10. Detach fuel line from retainer and remove heat insulation sleeve at fuel line connection.
11. ⚠ Risk of injury - fuel system operates under high pressure.To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection. — Pull release ring and disconnect fuel line (arrow).
12. Detach fuel line from retainer and remove heat insulation sleeve (1) at fuel line connection.
13. ⚠ Risk of injury - fuel system operates under high pressure.To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection. — Pull release ring and disconnect fuel line (arrow).
14. Push down protective sleeve (1) and disconnect fuel line.
15. First press hose connector (2) downwards (arrow A), then press release tabs (arrow B).
16. Pull off hose connector, keeping release tabs depressed.
17. Screw connectorV.A.G 1318/23 and adapter V.A.G 1318/17-1A onto K-Jetronic pressure testerV.A.G 1318.
18. Fit adapter V.A.G 1318/17-1A onto disconnected fuel line.
19. Screw adapterV.A.G 1318/11 onto K-Jetronic pressure testerV.A.G 1318.
20. Attach test hose (arrow) and hold end of hose in measuring container.
21. Open cut-off valve on pressure tester.
22. Build up pressure in fuel system by pressing the remote control button and slowly closing the cut-off valve on the pressure tester.
23. From this point on do not move position of cut-off valve.
24. Empty the measuring container.
25. Press remote control button for 15 seconds.
26. Compare amount of fuel delivered with minimum delivery shown in diagram (cm3/15 sec.). [Note: Voltage at fuel pump with engine stationary and pump running is approx. 2 volts less than battery voltage.]
27. Install back panel side trim (right-side) General body repairs, interior70Passenger compartment trim panels; Overview of fitting locations - passenger compartment trim panels.
28. Install rear seat bench General body repairs, interior72Rear seats; Removing and installing seat bench/individual seats.

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