Checking fuel pressure of supplementary fuel pump V393 — VW

🧭 Before you start

Fits: VW Phaeton (3D)

• Special tools named: VAS 6551

Don't miss

• The fuel pump will now be activated.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Bear in mind that the fuel pump can be activated due to opening of a door with the battery connected. Fuel can escape if the system has been opened. — Observe safety precautions .
2. Observe rules for cleanliness .
3. Switch off ignition.
4. Remove engine cover panel 10Engine cover; Removing and installing engine cover panel.
5. Remove intake hose and air filter upper part 23Diesel direct injection system; Assembly overview - air filter.

6. Detach clip (arrow) and pull fuel supply line (2) off supplementary fuel pump V393(1).
7. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.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 opening the connection point. — Fit hoseVAS 6551/1 into fuel supply line (2) and secure it with clip.
8. Connect hoseVAS 6551/1 to connection (B) of pressure tester (diesel)VAS 6551.
9. Connect standard hose (3) to connection (A) of pressure tester (diesel)VAS 6551 and secure it with clip.
10. Connect standard hose to connection of supplementary fuel pump V393(1) and secure it with a clip.
11. Switch on pressure testerVAS 6551 by pressing On/Off button.
12. Open shut-off taps (A) and (B) of pressure tester (diesel)VAS 6551(1).
13. Close shut-off valve (C).
14. Connect vehicle diagnostic tester.
15. Select Guided Functions.
16. Select function Bleed fuel system.
17. Follow instructions on vehicle diagnostic tester. [Note: The fuel pump will now be activated.]
18. Read off fuel pressure on pressure gaugeVAS 6551.
19. Exit function by pressing button ►.
20. Check fuel lines in engine compartment for possible restrictions (kinks), blockages and damages.
21. Check fuel lines in engine compartment for leaks.
22. Check fuel pressure of fuel pumps V276/V277.
23. Renew supplementary fuel pump V393.

Other VW procedures

• Removing and installing front sealing flange – VW Passat B5 · 6 torque figures
• Removing and installing timing chain covers – VW 3.0 TDI · 3 torque figures
• Removing, installing and checking ceramic glow pin plugs – VW · 5 torque figures
• Checking fuel pressure of fuel pumps V276/V277 – VW 3.0 TDI
• Checking radial clearance of conrods · 5 torque figures
• Removing engine · 41 torque figures
• Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
• Adjusting valve timing – VW Passat B5 · 83 torque figures
• Removing and installing camshafts – VW Passat B6 · 39 torque figures
• Removing and installing coolant pump · 53 torque figures