Checking delivery pressure in fuel return line: VW 1.2 TDI (CFWA)
Step-by-step checking delivery pressure in fuel return line for the VW 1.2 TDI (CFWA): 13 steps. What to remove, in what order, and what to check after.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: platform code 601
- Special tools named: VAS 6551/1, VAS 6551/2
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- The fuel pump is now activated for 30 seconds.
🔧 Engine codes this applies to
📋 Procedure
- ⚠ 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. — Remove engine cover Removing and installing engine10Removing and installing engine cover.
- Pull off fuel return line (6). To do this, press the quick-release couplings onto the unions, press in the locking elements (keep pressed) and pull the quick-release couplings off. Separate connectors .
- Collect escaping fuel with a cleaning cloth.
- Connect pressure testerVAS 6551 to lines VAS 6551/1 and VAS 6551/2 in fuel circuit.
- Switch on pressure testerVAS 6551 by pressing On/Off button.
- Open shut-off taps "“A”" and "“B”" of pressure testerVAS 6551 and close shut-off tap "“C”".
- Connect vehicle diagnosis tester and carry out guided function "“Fuel pump activation (checking fuel pump)”". [Note: The fuel pump is now activated for 30 seconds.]
- Read pressure on pressure testerVAS 6551. Specification: ≤ 0.3 bar.
- Start engine and run at idling speed.
- Read pressure on pressure testerVAS 6551. Specification: ≤ 0.3 bar.
- Place pressure testerVAS 6551 onto windscreen so that it can be read from inside of vehicle.
- Increase idling speed to 2500 rpm.
- Read pressure on pressure testerVAS 6551. Specification: ≤ 0.3 bar
Other VW procedures
- Checking fuel delivery rate of fuel system pressurisation pump G6
- Removing and installing fuel pressure regulating valve N276
- Removing and installing oil level and oil temperature sender G266 · 1 torque figures
- Removing and installing tensioning element for poly V-belt
- Removing and installing fuel tank (CFWA) – VW Polo 6R 1.2 TDI
- 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.