Checking fuel delivery rate, engine code BGU — AUDI

🧭 Before you start

Remove the filler cap, pull fuse SB33 and connect the remote control to its socket. Disconnect the return line at the regulator, fit VAS 6550/1 into a measuring container and run the pump about 5 seconds to fill the filter. Empty the container, run the pump 30 seconds while reading battery voltage and compare the quantity. If low, check the supply line, then measure before the filter with VAS 6550 set to 4 bar; renew the filter or delivery unit as indicated and bleed the system.

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

• Special tools named: V.A.G 1348/3A
• Renewed: fuel filter, fuel delivery unit

Don't miss

• Tape off the second contact of adapter cable V.A.G 1348/3-3 to avoid a short.
• Check fuel pressure first; delivery rate is measured at 4 bar.
• Measure battery voltage during the 30-second run; delivery depends on it.
• Release line pressure under a cloth and wear eye protection.
• Don't move the shut-off tap once 4 bar is set.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📋 Procedure

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

6. Connect crocodile clip to vehicle battery (+). [Note: Delivery rate of fuel pump must be measured at 4 bar. Check fuel pressure before measuring fuel delivery rate 24Checking fuel pressure regulator and holding pressure, engine code BGU.]
7. ⚠ 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 the return line (1) off the fuel pressure regulator. [Note: Press in securing ring to release fuel line.]
8. Connect adapterVAS 6550/1 to fuel pressure regulator. Hold end of adapter in measuring container.
9. Operate remote control V.A.G 1348/3A for approx. 5 seconds to fill fuel filter.
10. Drain measuring container.
11. The delivery rate of the fuel pump depends on the voltage. Therefore connect the multimeter to the battery.
12. Operate remote control for 30 seconds and simultaneously measure battery voltage.
13. Compare delivered quantity of fuel with specification.
14. Check supply line to filter for possible restrictions (kinks) or blockages.
15. Check fuel delivery rate before fuel filter as follows:
16. ⚠ 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.
17. Connect pressure testerVAS 6550 to fuel supply line with adapterVAS 6550/1. Hold adapterVAS 6550/2 in a measuring container.
18. Make sure that drain tap is closed and shut-off taps are open.
19. Operate remote controlV.A.G 1348/3A. Then slowly close shut-off tap (arrow) until a pressure of 4 bar is displayed on pressure gauge. From this point on do not move position of shut-off tap.
20. Drain measuring container.
21. Operate the remote control again for 30 seconds. Compare the fuel delivery rate with the first measurement.
22. Renew fuel filter.
23. Remove fuel delivery unit and check filter strainer for dirt.
24. Renew fuel delivery unit .
25. Reconnect all disconnected fuel lines.
26. Bleeding fuel system .

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