Checking delivery pressure and quantity for fuel system pressurisation pump G6 — VW

🧭 Before you start

Fits: VW Sharan II / SEAT Alhambra (7N, 2010–)

• Special tools named: VAS 6551

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• The fuel pump is now activated for 30 seconds.
• If the specified pressure is not attained, carry out "“test sequence for fuel filter”". Reason may be a blocked fuel filter.
• If the specified pressure is not attained, carry out "“test sequence on fuel filter”". Reason: fuel line may be pinched or kinked.
• Press in securing ring to release fuel lines.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Fuel supply line may be 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. — Remove engine cover panel .
2. Open clamp and pull fuel supply line (arrow) off the high-pressure pump.
3. Place connecting nippleVAS 6551/5-1 in supply line and secure with clamp.
4. Connect hoseVAS 6551/2 between connecting nippleVAS 6551/5-1 and connection point »A« of pressure tester (diesel)VAS 6551.
5. Connect hoseVAS 6551/1 to connection point »B« of pressure tester (diesel)VAS 6551.

6. Guide open end of hoseVAS 6551/1 into a suitable measurement container.
7. Switch on pressure testerVAS 6551 by pressing On/Off button.
8. Open shut-off taps "“A”" and "“B”" of pressure testerVAS 6551 and close shut-off tap "“C”".
9. 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.]
10. Carefully close shut-off tap "“B”" and set pressure of 4.5 ± 0.1 bar. [Note: If the specified pressure is not attained, carry out "“test sequence for fuel filter”". Reason may be a blocked fuel filter.]
11. After setting desired pressure, empty measurement container and carry out "“Guided Fault Finding, Checking electrical fuel pump(s)”" again.
12. Observe pressure on pressure testerVAS 6551.
13. After controlling pump (30 seconds), read supplied fuel quantity in measurement container. Target value: min. 1,400 ml.
14. Reconnect fuel supply line to high-pressure pump.
15. Pull off fuel supply line (B). To do this, press the quick-release couplings onto the connections, press in the locking elements (keep pressed) and pull the quick-release couplings off.
16. Connect hoseVAS 6551/2 between fuel line from fuel tank and connection point "“A”" of pressure testerVAS 6551.
17. Connect hoseVAS 6551/1 to connection point "“B”" of pressure tester (diesel)VAS 6551.
18. Guide open end of hoseVAS 6551/1 into a suitable measurement container.
19. Switch on pressure testerVAS 6551 by pressing On/Off button.
20. Open shut-off taps "“A”" and "“B”" of pressure testerVAS 6551 and close shut-off tap "“C”".
21. 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.]
22. Carefully close shut-off tap "“B”" and set pressure of 4.5 ± 0.1 bar. [Note: If the specified pressure is not attained, carry out "“test sequence on fuel filter”". Reason: fuel line may be pinched or kinked.]
23. After setting desired pressure, empty measurement container and carry out "“Guided Fault Finding, Checking electrical fuel pump(s)”" again.
24. Observe pressure on pressure testerVAS 6551.
25. After controlling pump (30 seconds), read supplied fuel quantity in measurement container. Target value: min. 1,400 ml.
26. Pull fuel supply line (black or black marking) (2) off fuel tank. [Note: Press in securing ring to release fuel lines.]
27. Collect escaping fuel with a cleaning cloth.
28. Connect hoseVAS 6551/2 between fuel line and connection point "“A”" of pressure testerVAS 6551.
29. Connect hoseVAS 6551/1 to connection point "“B”" of pressure tester (diesel)VAS 6551.
30. Guide open end of hoseVAS 6551/1 into a suitable measurement container.
31. Switch on pressure testerVAS 6551 by pressing On/Off button.
32. Open shut-off taps "“A”" and "“B”" of pressure testerVAS 6551 and close shut-off tap "“C”".
33. 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.]
34. Carefully close shut-off tap "“B”" and set pressure of 4.5 ± 0.1 bar.
35. After setting desired pressure, empty measurement container and carry out "“Guided Fault Finding, Checking electrical fuel pump(s)”" again.
36. Observe pressure on pressure testerVAS 6551.
37. After controlling pump (30 seconds), read supplied fuel quantity in measurement container. Target value: min. 1,400 ml.

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