Checking holding pressure (engine codes CAVA, CAVB, CAVC, CAVD) — VW

🧭 Before you start

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

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

Don't miss

• Watch pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3.0 bar.
• Search for leak on engine side. Repeat holding pressure test. This time, close shut-off tap (A) to check whether leak actually is on engine side.
• Make sure that drain tap is closed and cut-off taps are open.

🔧 Engine codes this applies to

📐 60 workshop diagrams for CAVA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Actuate fuel pump with final control diagnosis to build up fuel pressure.
2. Read fuel pressure on pressure gauge.
3. Watch pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3.0 bar.
4. Actuate fuel pump with final control diagnosis to build up fuel pressure.
5. After pressure has built up, close cut-off tap (B) of pressure tester immediately. Lever is then at right angle to direction of flow. [Note: Search for leak on engine side. Repeat holding pressure test. This time, close shut-off tap (A) to check whether leak actually is on engine side.]

6. Check fuel pipe to high-pressure pump for leaks.
7. Replace high-pressure pump Fuel preparation, injection24Removing and installing high-pressure pump
8. Check fuel supply line to fuel filter for leaks.
9. Check pressure retention valve in fuel delivery unit. Proceed as follows:
10. Pull fuel supply line (arrow) off fuel filter. Detach push-on connectors
11. Connect pressure testerVAS 6550 between fuel filter and fuel supply line with adapterVAS 6550/1 and VAS 6550/2.
12. Make sure that drain tap is closed and cut-off taps are open.
13. Actuate fuel pump with final control diagnosis to build up fuel pressure.
14. Read fuel pressure on pressure gauge.
15. After pressure has built up, close cut-off tap (A).
16. Watch pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3.0 bar.
17. Pressure retention valve in fuel pump defective; renew fuel delivery unit .
18. Pressure retention valve in fuel filter is OK, pressure limiting valve in fuel filter is defective. Renew fuel filter.

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