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

🧭 Before you start

Fits: VW Touran I (1T, 2003–2015)

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

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

🔧 Engine codes this applies to

📋 Procedure

1. Fold 2nd row seats forwards.
2. Separate carpet under seats and fold it back General body repairs, interior70Luggage compartment trims; Removing and installing luggage compartment floor.
3. Remove cover from fuel delivery unit.
4. First check that connector (1) is securely seated by pulling the connector without pressing the catch. The connector can cause a fault if it has not been fitted correctly.
5. Pull connector (1) off flange.

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

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