Removing and installing filler connection for natural gas tank — AUDI
Removing and installing filler connection for natural gas tank on Audi: 14 steps, engines CPWA. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A3 (8V, 2012–2020)
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- Carefully unscrew union nut (1) from connecting piece so that residual gas can escape; counterhold at connecting piece with a suitable tool.
🔧 Engine codes this applies to
📋 Procedure
- Observe safety precautions .
- Observe rules for cleanliness .
- ⚠ Escaped natural gas forms a flammable mixture.Risk of burn injuries.Dissipating pressure in high-pressure pipe — Disconnect battery Electrical system27Battery; Disconnecting and connecting battery.
- Open tank flap unit.
- Clean area around fuel filler neck.
- Detach filler cap (1) from filler connection.
- Remove rear wheel (right-side) Running gear, axles, steering44Wheels, tyres; Wheel change.
- Remove rear right wheel housing liner General body repairs - exterior66Wheel housing liner.
- Carefully unscrew union nut (1) from connecting piece so that residual gas can escape; counterhold at connecting piece with a suitable tool.
- Unscrew fuel line (1) at connecting piece.
- Seal off open connections with suitable plugs from engine bung setVAS 6122.
- ⚠ Filler connection has a left-hand thread. — Loosen nut (2) on filler connection in direction of (arrow) and remove.
- Unclip fuel line at filler pipe (arrows) and remove.
- Perform gas system inspection 821Natural gas system: checking for damage and leaks.
Other AUDI procedures
- Removing and installing camshaft housing – Audi Q3 · 3 torque figures
- Removing and installing camshaft adjuster – Audi · 1 torque figures
- Removing and installing fuel tanks together with mounting, natural gas tanks made of steel
- Removing and installing fuel tanks together with mounting, natural gas tanks made of composite material
- Removing and installing petrol fuel tank for vehicles with multi-link rear suspension
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 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.