Checking fuel pressure regulator and holding pressure (engine codes CBTA, CBUA, BGP, BGQ) — VW

🧭 Before you start

Fits: VW Golf V / Jetta (1K, 2003–2009); platform code 5M1

• Special tools named: VAS 6550/2
• Renewed: fuel pressure regulator, fuel delivery unit

Don't miss

• Make sure that drain tap is closed and cut-off taps are open.
• If engine does not start, activate fuel pump with final control diagnosis.
• From October 2005, the fuel pressure regulator has been integrated in the fuel filter and cannot be renewed individually.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Fuel supply line is pressurised. Wear eye protection and protective clothing to avoid possible injury and skin contact. Before loosening fuel lines, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection. — Disconnect fuel supply line (3) (metal coupling). To release line, press circlip (3) upwards into housing.
2. Connect pressure testerVAS 6550 to fuel supply line with adapterVAS 6550/1 and VAS 6550/2.
3. Make sure that drain tap is closed and cut-off taps are open.
4. Start engine and run at idling speed. [Note: If engine does not start, activate fuel pump with final control diagnosis.]
5. Read fuel pressure on pressure gauge.

6. Check fuel return line between fuel filter and flange for possible restrictions (kinks) or blockages.
7. Fuel pressure regulator defective, renew fuel pressure regulator.
8. Check fuel lines for possible restrictions (kinks) or blockages.
9. Renew fuel pressure regulator. [Note: From October 2005, the fuel pressure regulator has been integrated in the fuel filter and cannot be renewed individually.]
10. Repeat check.
11. Fuel pump defective, renew fuel delivery unit .
12. Watch pressure drop on pressure gauge.
13. Start engine and run at idling speed.
14. Switch off ignition and close shut-off tap (B) of pressure tester immediately.
15. Check fuel rail and injectors for leaks.
16. Check fuel lines for leaks.
17. Check fuel pump non-return valve .
18. Renew fuel pressure regulator . [Note: From October 2005, the fuel pressure regulator has been integrated in the fuel filter and cannot be renewed individually.]
19. Bleed fuel system 23Fuel preparation, injection; Injection system; Filling/bleeding fuel system.

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