Checking fuel pump non-return valve, engine code BGU — AUDI

🧭 Before you start

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

• Renewed: fuel delivery unit

Don't miss

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

🔧 Engine codes this applies to

📋 Procedure

1. Open cover of relay and fuse holder of engine compartment electronics box.
2. Pull fuse SB33 out of socket F33 of fuse holder.
3. Connect remote controlV.A.G 1348/3 A with adapter cableV.A.G 1348/3-3 to right terminal of fuse socket F33.
4. Tape off 2nd connector contact of the adapter cableV.A.G 1348/3-3 with insulating tape (arrow) to prevent short circuits.
5. Connect crocodile clip to vehicle battery (+).

6. ⚠ 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.
7. Connect pressure testerVAS 6550 to fuel supply line with adapterVAS 6550/1. Hold adapterVAS 6550/2 in a measuring container.
8. Close shut-off tap (A) of pressure gaugeVAS 6550 (lever at right angles to direction of flow).
9. Operate remote control at short intervals until a pressure of approx. 4 bar has built up.
10. ⚠ 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.
11. Observe pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3 bar.
12. Check line connections for leaks.
13. Fuel pump is defective, renew fuel delivery unit.

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