Checking fuel pump delivery rate - vehicles with 4.2 ltr. engine — AUDI

🧭 Before you start

Fits: Audi Q7 (4L, 2005–2015)

• Special tools named: V.A.G 1348, V.A.G 1348/3, V.A.G 1318/10, V.A.G 1318/11

Don't miss

• Disregard items marked (1, 3) and (arrows).
• Disregard (arrows).
• Disregard items (1) and (2).
• 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. ⚠ Risk of burn injuries.Allow exhaust system to cool down. — Unplug electrical connector (2). [Note: Disregard items marked (1, 3) and (arrows).] [Note: The fuel pump control unit J538 is located directly under the floor covering below the rear seat (right-side).]
2. Remove seat frame (right-side) of 2nd row of seats 72.
3. ⚠ Injury risk.Wear protective gloves. — Use a commercially available carpet knife (1) to cut open floor covering (right-side) along perforation (arrows).
4. Push floor covering to one side and unplug electrical connector (1). [Note: Disregard (arrows).]
5. Connect contact (2) of connector to the body (earth) using a test lead from auxiliary measuring setV.A.G 1594C.

6. Connect remote controlV.A.G 1348/3A for V.A.G 1348 with adapter cable V.A.G 1348/3-3 to contact (1) of connector.
7. Tape off 2nd connector contact of adapter cable V.A.G 1348/3-3 with insulating tape (arrow) to prevent short circuits.
8. Move switch of remote controlV.A.G 1348/3A for V.A.G 1348 to front of engine compartment.
9. Release retaining clip and open cover (A) above positive terminal.
10. Connect crocodile clip to positive terminal.
11. Remove filler cap from fuel filler neck.
12. Pull off engine cover panel (rear) (arrows).
13. ⚠ Risk of injury caused by fuel.To release the residual pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection. — Disconnect fuel supply line (3) at connecting piece. [Note: Disregard items (1) and (2).]
14. Connect K-Jetronic pressure testerV.A.G 1318 with adapters V.A.G 1318/10 and V.A.G 1318/11 to fuel line.
15. Fit test hose (arrow) onto pressure tester and hold end of hose into a container to catch escaping fuel.
16. Open cut-off valve on pressure tester.
17. Build up pressure in fuel system by pressing the remote control and slowly closing the cut-off valve on the pressure tester.
18. From this point on do not move position of cut-off valve.
19. Empty the measuring container.
20. Press remote control button for 15 seconds.
21. 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.] [Note: Secure all hose connections with the correct type of hose clips (same as original equipment) Electronic parts catalogue.]
22. Insert retaining frame (Electronic parts catalogue) in floor covering 70.
23. Install seat frame (right-side) of 2nd row of seats 72.

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