Checking fuel pressure of fuel system pressurisation pump G6 — VW

🧭 Before you start

Fits: platform codes 5C7, 5C1

• Special tools named: VAS 6551, VAS 6551/5
• Renewed: fuel delivery unit

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• The fuel pump is now activated for 30 seconds.

🔧 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 .Observe rules for cleanliness . — Remove engine cover 10Engine cover; Removing and installing engine cover.
2. Pull engine cover upwards in areas of (arrows) and in sequence shown.
3. To do this, grip beneath engine cover as far as possible.
4. ⚠ Fuel supply line is pressurised. 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 pulling hose off connection. — Pull fuel supply line (arrow) off the high-pressure pump.
5. Place connecting nippleVAS 6551/5-1 in supply line and secure with clamp.

6. Connect hoseVAS 6551/2 between connecting nippleVAS 6551/5-1 and connection point »A« of pressure tester (diesel)VAS 6551.
7. Connect hoseVAS 6551/1 to connection point »B« of pressure tester (diesel)VAS 6551/5-2 and high-pressure pump.
8. Switch on pressure testerVAS 6551 by pressing On/Off button.
9. Open clamp and pull fuel supply line (arrow) off the high-pressure pump.
10. Release and detach connector at supplementary fuel pump V393 or fuel pump 2V277 (Inline EFP) in engine compartment.
11. Fit connecting nippleVAS 6551/5-1(4) in supply line and secure with clamp.
12. Connect hoseVAS 6551/2(3) between connecting nippleVAS 6551/5-1(4) and connection point »A« of pressure tester (diesel)VAS 6551(1).
13. Connect hoseVAS 6551/1(2) to connection point »B« of pressure tester (diesel)VAS 6551/5-2(1) and high-pressure pump.
14. Switch on pressure testerVAS 6551 by pressing On/Off button.
15. Open shut-off valves (A) and (B) of pressure testerVAS 6551.
16. Close shut-off valve (C).
17. Connect Vehicle diagnosis tester and then carry out "„Guided Fault Finding, Checking electrical fuel pump(s)“". [Note: The fuel pump is now activated for 30 seconds.]
18. Read pressure shown by pressure testerVAS 6551.
19. Close shut-off valve (B) for a maximum period of 15 seconds.
20. Check fuel lines in engine compartment for possible restrictions (kinks), blockages and damages.
21. Check fuel lines in engine compartment for leaks.
22. Pull off fuel supply line (B). Separate connector couplings .
23. ⚠ Fuel supply line is pressurised. 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 pulling hose off connection. — Connect hoseVAS 6551/2 between fuel line from fuel tank and connection point (B) of pressure testerVAS 6551.
24. Connect hoseVAS 6551/1 to connection point (A) of pressure tester (diesel)VAS 6551 and fuel line leading to fuel filter.
25. Switch on pressure testerVAS 6551 by pressing On/Off button.
26. Open shut-off taps (A) and (B) of pressure testerVAS 6551.
27. Close shut-off valve (C).
28. Connect vehicle diagnosis tester and then repeat the guided function "„Checking electrical fuel pump(s)“".
29. Remove rear bench seat General body repairs, interior72Rear seat; Removing and installing bench seat / individual seats.
30. Unclip cover (1) for flange at retaining tabs (arrows), using removal wedge3409.
31. Release fuel supply line (1) and pull it off sealing flange. Separate connector couplings .
32. ⚠ Fuel supply line is pressurised. 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 pulling hose off connection. — Connect pressure testerVAS 6551 with adapterVAS 6551/1 and adapterVAS 6551/2 between fuel supply line and fuel delivery unit.
33. Open shut-off tap (A).
34. Close shut-off valves (B) and (C) of pressure testerVAS 6551.
35. Connect vehicle diagnosis tester and then repeat the guided function "„Checking electrical fuel pump(s)“".
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 whether all hoses are connected (arrows).
41. Renew fuel delivery unit .

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