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Removing and installing natural gas tanks 1 and 2 — AUDI

Removing and installing natural gas tanks 1 and 2 on Audi: 11 steps, engines BCA, BGU, BSE, BSF. 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.

11 steps 7 engine codes

🧭 Before you start

Fits: VW Caddy III (2K, 2004–2015); platform code 2C0

Don't miss

  • Due to limited space, the handwheels for mechanical shut-off valves have been discontinued.Close the mechanical shut-off valves using a commercially available spanner.
  • When loosening the high-pressure lines, counterhold on unions with a suitable tool (arrows).
  • When the fuel tanks have to be stored temporarily, use bracket T10351 for this purpose.

🔧 Engine codes this applies to

📐 57 workshop diagrams for BCA

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

Removing and installing natural gas tanks 1 and 2 — BCA · diagram 1
Removing and installing natural gas tanks 1 and 2 — BCA · diagram 2
Removing and installing natural gas tanks 1 and 2 — BCA · diagram 3
Removing and installing natural gas tanks 1 and 2 — BCA · diagram 4
Removing and installing natural gas tanks 1 and 2 — BCA · diagram 5
Removing and installing natural gas tanks 1 and 2 — BCA · diagram 6
Removing and installing natural gas tanks 1 and 2 — BCA · diagram 7
Removing and installing natural gas tanks 1 and 2 — BCA · diagram 8
+ 49 more diagrams

📋 Procedure

  1. Remove rear silencer 26.
  2. Remove protective covers on underbody:
  3. To remove fuel tanks, separate connectors (1) from tank shut-off valve on all fuel tanks (natural gas).
  4. Close mechanical shut-off valves (2) and (3) on all natural gas tanks. [Note: Due to limited space, the handwheels for mechanical shut-off valves have been discontinued.Close the mechanical shut-off valves using a commercially available spanner.] [Note: Observe safety precautions when working on natural gas system .The fuel tank 1 is removed together with fuel tank 2.]
  5. ⚠ Release pressure in the system before working on the natural gas system. Connecting and carrying out Guided Function "“Releasing pressure in the natural gas high-pressure line”". — Carefully loosen unions of high-pressure lines (1) to allow remaining gas to leak out. [Note: When loosening the high-pressure lines, counterhold on unions with a suitable tool (arrows).]
BCA? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Remove high-pressure lines from connections.
  2. Position engine and gearbox jackV.A.G 1383 A(1) below support of fuel tanks (2).
  3. Release fuel tank support on both sides (arrows).
  4. Slowly lower engine and gearbox jackV.A.G 1383 A.
  5. Release securing straps of fuel tanks (arrow).
  6. If one tank or the tank shut-off valve is to be exchanged, empty tank . [Note: When the fuel tanks have to be stored temporarily, use bracket T10351 for this purpose.]
Workshop diagrams

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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.

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Workshop data on this page last updated 20 Sep 2026.