Removing and installing both natural gas tanks with mounting — AUDI

🧭 Before you start

Fits: Audi A3 (8V, 2012–2020)

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• When working on the natural gas tanks, take care not to damage the surface of the tanks. If necessary, protect the tank surface using suitable workshop materials.
• Take care not to bend or deform the pipes. — Carefully release union nuts (1) so that residual gas can escape; counterhold at connections with a suitable tool.
• For illustration purposes the natural gas tank is shown without the engine and gearbox jackV.A.G 1383 A.

🔧 Engine codes this applies to

📋 Procedure

1. Observe safety precautions .
2. Observe rules for cleanliness .
3. ⚠ Before using the gearbox support T40173, it is important to check that you have the correct version of this tool.Older versions of this tool must not be used and must be replaced with the latest version.Distinguishing features of latest version:On the latest version of this tool, the parts shown in (red) in the illustration (arrows) have a yellow chromated finish.If the support does not meet the specifications, proceed as follows:Germany: Contact Matra to have the tool replaced.All countries except Germany: Contact your Importer to have the tool replaced. — Prepare engine and gearbox jackV.A.G 1383 A with gearbox support T40173, adapter T40173/2 and support elements T40173/3, as shown in illustration. [Note: When working on the natural gas tanks, take care not to damage the surface of the tanks. If necessary, protect the tank surface using suitable workshop materials.]
4. ⚠ Escaped natural gas forms a flammable mixture.Risk of burn injuries.Dissipate pressure in high-pressure pipe . — Disconnect battery Electrical system27Battery; Disconnecting and connecting battery.
5. Release and detach connectors (arrows) from fuel tank shut-off valve 1N361(1) and from fuel tank shut-off valve 2N362(2).

6. ⚠ Take care not to bend or deform the pipes. — Carefully release union nuts (1) so that residual gas can escape; counterhold at connections with a suitable tool.
7. Remove union nuts (1), take high-pressure pipe out of retainers and detach.
8. Remove union nuts (2), take high-pressure pipe out of retainers and detach.
9. Seal off open connections with suitable plugs from engine bung setVAS 6122.
10. Position engine/gearbox jackV.A.G 1383 A with gearbox support T40173 under natural gas tank (1).
11. Raise engine and gearbox jackV.A.G 1383 A until gearbox support T40173 makes contact.
12. Unclip brake lines (arrow) (left and right).
13. Remove bolts (arrows) and lower natural gas tank (1) slowly using engine and gearbox jackV.A.G 1383 A. [Note: For illustration purposes the natural gas tank is shown without the engine and gearbox jackV.A.G 1383 A.]
14. ⚠ Take care not to bend or deform the fuel lines.The fuel lines must be fitted so that they are free of tension; tighten them by hand initially until contact is made, then tighten to final torque Exploded view - fuel tanks (natural gas).The original routing must be restored when installing fuel lines.Ensure sufficient clearance from all moving or hot components. — Perform gas system inspection 821Natural gas system: checking for damage and leaks.
15. Using hand wheel T50026, open mechanical shut-off valve on fuel tank shut-off valve 1N361(2).
16. Using hand wheel T50026, open mechanical shut-off valve on fuel tank shut-off valve 2N362(1).
17. Fit underbody trim below natural gas tanks General body repairs - exterior66Underbody trim.

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