Removing and installing fuel tank 2 from and to mounting, natural gas tanks made of composite material — VW

🧭 Before you start

Lower both tanks with the mounting, place them upside down on the bench and measure the strap positions. Undo the strap bolts and, with help, spread the straps to take the tank out. Fit new strap pads, seat the straps in their guides, insert the tanks and align them with the straightedge, then tighten the straps alternately and check clearance.

Fits: VW Golf VII Variant (BA), VW Golf VII (5G, 2012–2020)

• Renewed: securing strap pads

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• Renew securing strap pads after each removal.
• Measure strap position (dimension a) before undoing anything to make refitting easier.
• If both tanks come out or the mounting is renewed, natural gas tank 1 goes back in first.
• The strap torque applies only to an empty tank.
• Do not leave composite tanks unpressurised for long; refit a removed shut-off valve immediately.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📋 Procedure

1. Observe safety precautions Safety instructions.
2. Observe rules for cleanliness .
3. Observe safety precautions when working on natural gas system . [Note: If both natural gas tanks are removed, or if the mounting for natural gas tanks is renewed, then the natural gas tank 1 needs to be reinstalled first.]
4. Remove fuel tanks together with mounting .
5. Remove both fuel tanks together with mounting from engine and gearbox jack, and place them on workbench upside down, i.e. with mounting facing downwards. [Note: Take care not to damage surfaces when working on fuel tanks. If necessary, protect surface with suitable workshop equipment.]

6. Measure installation position of securing straps to ease correct reinstallation (dimension a).
7. Unscrew bolts (arrows) on securing straps.
8. ⚠ The securing straps are slightly under tension. — With the aid of a second mechanic, pull securing straps apart slightly, and guide out fuel tanks. [Note: The aid of a 2nd mechanic is required to install the fuel tank.Renew securing strap pads after each removal.Specified torque for securing straps applies only to an empty tank.]
9. ⚠ Natural gas tanks made of composite material must not be stored without pressure for longer periods of time.If the fuel tank shut-off valve has been removed, the fuel tank shut-off valve must be reinstalled immediately after the repair work has been completed. — Draining fuel tank
10. When installing, pay particular attention not to damage surface of fuel tank.
11. Ensure proper seating of securing straps (1) in mounting (2).
12. Securing straps (1) must be seated in guide (3).
13. Renew securing strap pads after each removal.
14. Position securing strap pads on fuel tank.
15. With the aid of a second mechanic, pull securing straps apart slightly, and guide in fuel tanks.
16. Check installation position of fuel tank relative to mounting, and align it as necessary .
17. Use straight edge 500 mmVAS 6075 to align fuel tank (2) relative to fuel tank (1) by moving fuel tank accordingly.
18. Make sure that straightedge 500 mmVAS 6075 lies flat against fuel tank shut-off valves(arrow).
19. Use straight edge 500 mmVAS 6075 to align fuel tank by turning fuel tank accordingly.
20. Turn fuel tank 2 so that straightedge 500 mmVAS 6075 rests flat against fuel tank shut-off valves.
21. Insert fuel tank 1 into mounting, and install fuel tank .
22. With aid of second mechanic, pull securing straps apart slightly, and insert fuel tank 2.
23. Insert fuel tank 2 into mounting.
24. Check installation position of fuel tank relative to mounting, and align it as necessary .
25. Use straight edge 500 mmVAS 6075 to align fuel tank (1) relative to fuel tank (2) by moving fuel tank accordingly.
26. Make sure that straightedge 500 mmVAS 6075 lies flat against fuel tank shut-off valves(arrow).
27. Use straight edge 500 mmVAS 6075 to align fuel tank by turning fuel tank accordingly.
28. Turn fuel tanks so that straightedge 500 mmVAS 6075 rests flat against fuel tank shut-off valves.
29. Align fuel tank so that fuel lines can be connected free of stress.
30. Check installation position of fuel tank relative to mounting, and align it as necessary .
31. Note installation position of securing strap pads .
32. Close securing straps .
33. Note installation position of securing straps .
34. Tighten securing straps alternately (arrows).
35. Following installation, make sure that there is sufficient clearance between fuel tanks and mounting.
36. Install fuel tanks together with mounting .

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