Checking the delivery pressure of the fuel pump (0.5 bar low-pressure fuel system) — VW
Checking the delivery pressure of the fuel pump (0.5 bar low-pressure fuel system) on VW: 18 steps, engines CBAA, CBAB, CBBA, CBBB.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Tiguan I (5N, 2007–2016)
- Special tools named: VAS 6551/1, VAS 6551/2
- Renewed: fuel delivery unit
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- Separate quick-release fastener (A) (black or with black marking) of fuel supply line. Separate plug-in connectors .
- Pull fuel supply line (black or black marking) (A) off fuel delivery unit. Separate plug-in connectors .
📋 Procedure
- Separate quick-release fastener (A) (black or with black marking) of fuel supply line. Separate plug-in connectors .
- Connect pressure testerVAS 6551 with lines VAS 6551/1 and VAS 6551/2 to open ends of fuel supply line.
- Switch on pressure testerVAS 6551 by pressing On/Off button.
- Open shut-off taps "“A”" and "“B”" of pressure tester, and close shut-off tap "“C”".
- Start engine and run at idling speed.
- Close shut-off tap "“B”" for a maximum of 15 seconds and, during this period, take pressure reading on pressure testerVAS 6551. Specification at least 0.5 bar.
- If the delivery pressure temporarily drops, renew fuel delivery unit.
- In the event of engine running problems, renew fuel filter to eliminate potential fuel filter blockage problem.
- Remove rear bench seat General body repairs, interior72Rear seats; Removing and installing bench seat / individual seats.
- Release carpet under seats, and fold it towards rear. General body repairs, interior70Interior trim; Assembly overview - foot support and floor covering
- Remove cover of fuel delivery unit.
- Pull fuel supply line (black or black marking) (A) off fuel delivery unit. Separate plug-in connectors .
- Connect pressure testerVAS 6551 with lines VAS 6551/1 and VAS 6551/2 to open ends of fuel supply line and fuel delivery unit.
- Switch on pressure testerVAS 6551 by pressing On/Off button.
- Open shut-off taps "“A”" and "“B”" of pressure tester, and close shut-off tap "“C”".
- Start engine and run at idling speed.
- Close shut-off tap "“B”" for a maximum of 15 seconds and, during this period, take pressure reading on pressure testerVAS 6551. Specification at least 0.5 bar.
- Check fuel delivery rate of fuel pump .
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- Removing and installing pump for exhaust gas recirculation cooler V400
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- Removing and installing exhaust gas temperature sender 4G648
- Removing and installing Hall sender – VW 2.0 TDI
- Removing and installing upper part of fuel filter
- 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
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.