Emptying the gas line — VW
Emptying the gas line on VW: 18 steps, engines CMAA, CNKA. 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: VW Polo 6R (2009–2014)
Don't miss
- Switching (1) to gas mode is briefly displayed in dash panel insertK.
- Read and observe safety information displayed!
- Connector remains connected.
📋 Procedure
- ⚠ Autogas is heavier than air!There must be no cavities in the ground (depressions, pits, channels, cellars or other hollow areas into which the gas can flow).There must be no ignition sources present, e.g. exposed flame, sparks, electrostatic discharge or hot surfaces, that could cause the Autogas to ignite. — Connect vehicle diagnosis, testing and information systemVAS 5051B.
- Open clamp (1) and remove cap (2) from Autogas tank.
- Start engine. [Note: Switching (1) to gas mode is briefly displayed in dash panel insertK.]
- Switch vehicle diagnosis tester on.
- Select "“Guided fault finding”" field on screen.
- Press > field to confirm.
- Select one after another:
- Confirm vehicle identification
- Select "“01 - Systems capable of self-diagnosis”"(arrow) and confirm with >.
- Select "“01 - Engine management system”"(arrow) and confirm with >.
- Select "“01 - Functions”"(arrow) and confirm with >.
- Select "“Read pressure in gas rail”" function (arrow) and confirm with >. [Note: Read and observe safety information displayed!]
- Confirm safety note with > field.
- Undo nut (1) from gas tank valve N495(2) and pull valve off (in direction of arrow). [Note: Connector remains connected.]
- Confirm > field.
- The following functions can be selected with fields 1 to 3:
- Stop engine.
- ⚠ There is a danger of injury due to escaping gas.The system is pressurised.Wear suitable protection such as eye protection and protective gloves.Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection. — Carefully detach gas line from vaporiser.
Other VW procedures
- Renewing camshaft oil seals – VW Sharan I / SEAT Alhambra · 3 torque figures
- Checking semi-automatic toothed belt tensioner – VW · 1 torque figures
- Removing and installing anti-theft engine control unit J623 · 1 torque figures
- Removing and installing inlet valve – VW Golf VI · 1 torque figures
- Emptying the fuel tank (Autogas)
- 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.