Checking fuel 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 filter, fuel delivery unit

Don't miss

• Make sure that drain tap is closed and cut-off taps are open.
• Close shut-off valve (A) slowly. Pressure must rise to min. 7.0 bar. When 7.0 bar is reached, open shut-off tap again immediately.

🔧 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 hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection. — Pull off supply line (metal coupling) (arrow) and catch escaping fuel with a cloth. Detach push-on connectors
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. Actuate fuel pump with final control diagnosis to build up fuel pressure.
5. Read fuel pressure on pressure gauge.

6. Check return line between fuel filter and fuel pump for kinks and blockages.
7. Pressure limit valve in fuel filter is defective. Renew fuel filter.
8. Check fuel pressure upstream of fuel filter; proceed as follows:
9. Pull fuel supply line (arrow) off fuel filter. Detach push-on connectors
10. Connect pressure testerVAS 6550 between fuel filter and fuel supply line with adapterVAS 6550/1 and VAS 6550/2.
11. Make sure that drain tap is closed and cut-off taps are open.
12. Actuate fuel pump with final control diagnosis to build up fuel pressure.
13. Close shut-off valve (A) slowly. Pressure must rise to min. 7.0 bar. When 7.0 bar is reached, open shut-off tap again immediately.
14. Fuel pump is OK. Pressure limiting valve in fuel filter is defective. Renew fuel filter.
15. Fuel pump defective, renew fuel delivery unit .

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