Checking delivery pressure of fuel pump, engine codes CBAA, CBAB, CBBB, CBAC — VW

🧭 Before you start

Fits: VW Passat CC (357, 2008–2012)

• Special tools named: VAS 6551/1, VAS 6551/2
• Renewed: fuel delivery unit, fuel filter

Don't miss

• Separate quick-release coupling (A) (completely black or with black marking) of fuel supply line.
• Renew fuel filter, for engine running problems, to ensure the fuel filter is not blocked.
• Press in securing ring to release fuel line.
• Pull fuel supply line (black or black marking) (A) off fuel delivery unit.
• After completing assembly, check all quick-release fasteners are engaged correctly by pulling back on fastener.

🔧 Engine codes this applies to

📋 Procedure

1. Separate quick-release coupling (A) (completely black or with black marking) of fuel supply line.
2. Connect pressure testerVAS 6551 with cables VAS 6551/1 and VAS 6551/2 to open ends of fuel supply line.
3. Switch on pressure testerVAS 6551 by pressing On/Off button.
4. Open shut-off taps "“A”" and "“B”" of pressure tester and close shut-off tap "“C”".
5. Start engine and run at idling speed.

6. Close shut-off tap "“B”" for a maximum of 15 seconds and read the available pressure on the pressure testerVAS 6551 within this time. Specification min. 0.5 bar.
7. If the delivery pressure temporarily drops, renew fuel delivery unit.
8. Renew fuel filter, for engine running problems, to ensure the fuel filter is not blocked.
9. Remove rear bench seat General body repairs, interior72Rear seats; Removing and installing bench seat / individual seats.
10. Detach carpet under seats and fold it back. General body repairs, interior70Interior trim; Assembly overview - foot support and floor covering
11. Remove cover from fuel delivery unit. [Note: Press in securing ring to release fuel line.]
12. Pull fuel supply line (black or black marking) (A) off fuel delivery unit.
13. Connect pressure testerVAS 6551 to open ends of fuel supply pipe and fuel delivery unit using lines VAS 6551/1 and VAS 6551/2.
14. Switch on pressure testerVAS 6551 by pressing On/Off button.
15. Open shut-off taps "“A”" and "“B”" of pressure tester and close shut-off tap "“C”".
16. Start engine and run at idling speed.
17. Close shut-off tap "“B”" for a maximum of 15 seconds and read the available pressure on the pressure testerVAS 6551 within this time. Specification min. 0.5 bar.
18. Check delivery rate of fuel pump . [Note: After completing assembly, check all quick-release fasteners are engaged correctly by pulling back on fastener.]

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