Checking fuel pressure, engine codes CUVC, CUVE, CUWA: VW Tiguan I (CUVC, CUVE, CUWA)

🧭 Before you start

Fits: VW Tiguan I (5N, 2007–2016)

• Special tools named: VAS 6551
• Renewed: fuel delivery unit

Don't miss

• Ensure that drain tap (C) on pressure testerVAS 6551(1) is closed.
• The fuel pump is now activated.
• If the filter strainer is not clogged/soiled, if all lines are connected and the fuel pressure specification is still not attained, the fuel delivery unit is defective.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Bear in mind that the fuel pump can be activated due to opening of a door with the battery connected. Fuel can escape if the system has been opened. — Observe safety precautions .
2. Observe rules for cleanliness .
3. Switch off ignition.
4. Remove engine cover panel 10Engine cover panel; Removing and installing engine cover panel.
5. Open clips (arrow).

6. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. — Pull fuel supply line (1) off high-pressure pump (2).
7. Insert connection fittingVAS 6551/5-1 into fuel supply line (1) and secure it with a clip.
8. Connect hoseVAS 6551/2 between connecting fittingVAS 6551/5-1 and connection point (A) of pressure tester (diesel)VAS 6551.
9. Connect hoseVAS 6551/5-2 between connection (B) of pressure tester (diesel)VAS 6551 and high-pressure pump (2).
10. Secure hoseVAS 6551/5-2 to high-pressure pump (2) with a clip.
11. Switch on pressure testerVAS 6551 by pressing On/Off button.
12. Ensure that drain tap (C) on pressure testerVAS 6551(1) is closed.
13. Shut-off valves (A) and (B) on pressure testerVAS 6551(1) are open.
14. Connect vehicle diagnostic tester.
15. Select guided function 01 Actuating fuel pump.
16. Select function Checking fuel pump delivery pressure/delivery rate.
17. Follow instructions on vehicle diagnostic tester. [Note: The fuel pump is now activated.]
18. Read off fuel pressure on pressure gaugeVAS 6551.
19. Check fuel lines in engine compartment for possible restrictions (kinks), blockages and damages.
20. Check fuel lines in engine compartment for leaks.
21. Pull off supply line (B), and catch escaping fuel with a cloth. Separate plug-in connectors .
22. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. — Connect hoseVAS 6551/2 between fuel supply line from fuel tank and connection point (B) of pressure testerVAS 6551.
23. Connect hoseVAS 6551/1 between connection point (A) of pressure tester (diesel)VAS 6551 and fuel line (1) leading to fuel filter.
24. Switch on pressure testerVAS 6551 by pressing On/Off button.
25. Ensure that drain tap (C) on pressure testerVAS 6551(1) is closed.
26. Shut-off valves (A) and (B) on pressure testerVAS 6551(1) are open.
27. Repeat function Checking fuel pump delivery pressure/delivery rate.
28. Remove rear bench seat General body repairs, interior72Rear seat; Removing and installing bench seat / individual seats.
29. Unclip cover (1) at retaining tabs (arrows), using removal wedge3409.
30. ⚠ Bear in mind that the fuel pump can be activated due to opening of a door with the battery connected. Fuel can escape if the system has been opened. — Disconnect fuel return line (1) on sealing flange. Separate plug-in connectors .
31. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. — Connect pressure testerVAS 6551 and fuel supply line leading to fuel filter by means of hoseVAS 6551/1.
32. Connect hoseVAS 6551/2 between pressure testerVAS 6551 and fuel delivery unit.
33. Ensure that drain tap (C) on pressure testerVAS 6551(1) is closed.
34. Shut-off valves (A) and (B) on pressure testerVAS 6551(1) are open.
35. Repeat function Checking fuel pump delivery pressure/delivery rate.
36. Check fuel lines leading to engine for possible restrictions (kinks), blockages and damages.
37. Check fuel lines for leaks.
38. Remove fuel delivery unit .
39. Check filter strainer for soiling.
40. Check that all electrical wires are connected correctly.
41. Pull on connectors to check they are firmly seated.
42. Check whether all hoses are connected (arrows). [Note: If the filter strainer is not clogged/soiled, if all lines are connected and the fuel pressure specification is still not attained, the fuel delivery unit is defective.]
43. Renew fuel delivery unit .

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