Checking fuel pump delivery rate - TFSI engine: Audi A3 (AXW, AXX, BAG, BDB, …)

🧭 Before you start

Fits: Audi A3 (8P, 2003–2012)

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

Don't miss

• Disregard (item 1).
• Open cut-off valve on pressure tester. Lever must point in direction of flow.
• From this point on do not move position of cut-off valve.
• Voltage at fuel pump with engine stationary and pump running is approx. 2 volts less than battery voltage.

🔧 Engine codes this applies to

📋 Procedure

1. Remove rear seat bench 72.
2. Unclip the retaining tabs (arrows) for the flange cover (right-side).
3. Unplug electrical connector (arrow) at flange.
4. 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.
5. Tape off 2nd connector contact of adapter cable V.A.G 1348/3-3 with insulating tape (arrow) to prevent short circuits.

6. Connect contact (5) to the body (earth) using a test lead from auxiliary measuring setV.A.G 1594C.
7. Connect crocodile clip to battery "“+”".
8. Remove filler cap from fuel filler neck.
9. ⚠ 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. — Disconnect fuel line (2) (lift release tab). [Note: Disregard (item 1).]
10. Screw connectorV.A.G 1318/23 and adapter V.A.G 1318/17-1 onto K-Jetronic pressure testerV.A.G 1318.
11. Fit adapter V.A.G 1318/17-1 onto disconnected fuel line.
12. Screw adapterV.A.G 1318/11 onto K-Jetronic pressure testerV.A.G 1318. Attach test hose (arrow) and hold end of hose in measuring container.
13. Open cut-off valve on pressure tester. Lever must point in direction of flow.
14. Build up pressure in fuel system by pressing the remote control and slowly closing the cut-off valve on the pressure tester.
15. From this point on do not move position of cut-off valve.
16. Empty the measuring container.
17. Press remote control button for 15 seconds.
18. 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.]
19. Install rear seat bench 72.

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