Checking delivery pressure of fuel system pressurisation pump G6 (CFWA) — VW

🧭 Before you start

Fits: VW Polo 6R (2009–2014)

• Special tools named: VAS 6551/1, VAS 6551/2

Don't miss

• The fuel pump is now activated for 30 seconds.
• Beginning 11/12, a new pressure regulator integrated in the fuel delivery unit is being gradually introduced. In this case, the additional fuel filter and bypass return line are omitted.
• Pull fuel supply line (black or black marking) (4) off fuel delivery unit. Disconnect push-on connector .

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ 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. — Remove engine cover Removing and installing engine 10. Removing and installing engine cover.
2. Push the fuel filter plug-in connector (fuel supply line to the high-pressure pump) forwards onto the filter connection. Press catches in and hold, pull fuel supply line from fuel filter. Disconnect push-on connector (see the separate procedure).
3. Collect escaping fuel with a cleaning cloth.
4. Connect pressure tester VAS 6551 to lines VAS 6551/1 and VAS 6551/2 in fuel circuit.
5. Switch on pressure tester VAS 6551 by pressing On/Off button.

6. Open shut-off taps "“A”" and "“B”" of pressure tester VAS 6551 and close shut-off tap "“C”".
7. Connect vehicle diagnosis tester and carry out guided function "“Fuel pump activation (checking fuel pump)”". [Note: The fuel pump is now activated for 30 seconds.]
8. Read pressure on pressure tester VAS 6551. Specification: min. 4.5 bar.
9. Start engine and run at idling speed.
10. Read pressure on pressure tester VAS 6551. Specification: min. 4.5 bar.
11. Place pressure tester VAS 6551 onto windscreen so that it can be read from inside of vehicle.
12. Increase idling speed to 2500 rpm.
13. Read pressure on pressure tester VAS 6551. Specification: min. 4.5 bar
14. Reconnect fuel supply line to high-pressure pump at fuel filter.
15. Push plug-in connector on fuel filter fuel delivery line to fuel filter, forwards onto filter connection.
16. Press catch in and hold, pull fuel supply line from fuel filter. Disconnect push-on connector (see the separate procedure).
17. Collect escaping fuel with a cleaning cloth.
18. Connect pressure tester VAS 6551 with lines VAS 6551/1 and VAS 6551/2 to open ends.
19. Perform pressure measurement as in previous check.
20. The fuel filter must be renewed (see the separate procedure). [Note: Beginning 11/12, a new pressure regulator integrated in the fuel delivery unit is being gradually introduced. In this case, the additional fuel filter and bypass return line are omitted.]
21. Reconnect plug-in connector to fuel filter.
22. Raise cover of fuel delivery unit.
23. First check that connector (arrow) is fitted securely by pulling connector without pressing catch. The connector can cause a fault if it has not been fitted correctly.
24. Pull fuel supply line (black or black marking) (4) off fuel delivery unit. Disconnect push-on connector (see the separate procedure).
25. Collect escaping fuel with a cleaning cloth.
26. Connect connection (A) of pressure tester VAS 6551 with line VAS 6551/1 to open end of fuel delivery unit.
27. Open shut-off taps "“B”" + "“C”" of pressure tester VAS 6551.
28. Switch on pressure tester VAS 6551 by pressing On/Off button.
29. Connect vehicle diagnosis tester and carry out guided function "“Fuel pump activation (checking fuel pump)”". [Note: The fuel pump is now activated for 30 seconds.]
30. Read pressure on pressure tester VAS 6551. Specification: 7.2 ± 0.5 bar. [Note: Beginning 11/12, a new pressure regulator integrated in the fuel delivery unit is being gradually introduced. In this case, the additional fuel filter and bypass return line are omitted.]
31. Replace additional fuel filter or fuel delivery unit with integrated pressure regulator.

Other VW procedures

• Removing and installing engine oil cooler · 2 torque figures
• Removing and installing balance shaft module – VW Polo 6R · 1 torque figures
• Renewing valve stem seals with cylinder head removed – VW CDLJ
• Removing and installing exhaust gas recirculation cooler
• Removing and installing particulate filter (RHD) – VW CFWA
• Removing engine · 41 torque figures
• Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
• Adjusting valve timing – VW Passat B5 · 83 torque figures
• Removing and installing camshafts – VW Passat B6 · 39 torque figures
• Removing and installing coolant pump · 53 torque figures