Checking vacuum at high-pressure fuel pump (venturi nozzle) — VW

🧭 Before you start

Fits: VW Polo 6R (2009–2014)

🔧 Engine codes this applies to

📐 51 workshop diagrams for CFWA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Remove engine cover panel .
2. ⚠ Always read rules for cleanliness and instructions for working on fuel system.Always follow these rules for cleanliness and instructions before starting work and while working on the fuel system.Wrap a clean cloth around the connection before opening the fuel system, then carefully loosen the connection to release the pressure. — Carefully release fuel return line at high-pressure pump.
3. Carefully pull fuel return line out of high-pressure pump.
4. Connect free end of fuel return line to hose adapterVAS 6551/3, then put it into a ≤ 3 litre measuring container (3) and hold there.
5. Connect pressure testerVAS 6551 with hose adapterVAS 6551/4 from connection (A) to high-pressure pump.

6. Close shut-off tap of pressure testerVAS 6551(A) + (B) and open (C).
7. Connect free connection (arrow) at high-pressure pump to hose adapterVAS 6550/4.
8. Ask a second mechanic for assistance.
9. Switch on pressure testerVAS 6551 by pressing On/Off button and calibrate it.
10. Switch ignition on.
11. Start engine.
12. Read pressure on pressure testerVAS 6551.

Other VW procedures

• Filling, bleeding fuel system – VW Touareg II
• Removing and installing injector seal in cylinder head cover
• Removing and installing oil supply line and oil return (turbocharger support)
• Checking hydraulic compensation elements – VW Touareg II
• Checking vacuum between high-pressure fuel pump (venturi nozzle) and injectors
• 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