Checking fuel pump non-return valve, engine codes BSE, BSF — AUDI

🧭 Before you start

Fits: VW Caddy III (2K, 2004–2015); platform code 2C0

• Special tools named: VAS 5565
• Renewed: fuel delivery unit

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• Observe pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3 bar.

🔧 Engine codes this applies to

📋 Procedure

1. Remove bench seat 72Second row seats; Rear seats; Removing and installing bench seat.
2. Remove cover of fuel delivery unit.
3. First check that the connector (arrow) is fitted securely by pulling connector without pressing catch. The connector can cause a fault if it has not been fitted correctly.
4. Pull off connector.
5. Check contacts on connector and on fuel delivery unit for damage.

6. Connect test instrument adapter/DSO (5-pin)VAS 5565 to connector and fuel delivery unit.
7. Connect remote control for V.A.G 1348V.A.G 1348/3A to test instrument adapter/DSO (5-pin)VAS 5565 and to battery positive (+).
8. ⚠ 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. — Pull fuel supply line (arrow) off fuel filter.
9. Connect pressure testerVAS 6550 to fuel supply line with adapterVAS 6550/1. Hold adapterVAS 6550/2 in a measuring container.
10. Close shut-off tap (A) of pressure gaugeVAS 6550 (lever at right angles to direction of flow).
11. Operate remote control at short intervals until a pressure of approx. 4 bar has built up.
12. ⚠ Danger of spray when shut-off tap is opened; wear eye protection and protective clothing to avoid injuries and skin contact. Hold container in front of open connection of pressure tester. — Reduce excessive pressure by carefully opening shut-off tap.
13. Observe pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3 bar.
14. Check line connections for leaks.
15. Fuel pump is defective, renew fuel delivery unit.

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