Removing and installing natural gas tanks 1 and 2 — VW

Removing and installing natural gas tanks 1 and 2
Special tools and workshop equipment required
Engine and gearbox jack
V.A.G 1383 A
Torque wrench
V.A.G 1331
Removing
Prerequisite
Vehicle must be at room temperature (at least 14 °C).
Remove rear silencer
Rep. gr.
26
.
Remove protective covers on underbody:
Caddy
Chapter
Caddy Maxi
Chapter
To remove fuel tanks, separate connectors
1
from tank shut-off valve on all fuel tanks (natural gas).
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.
WARNING
Release pressure in the system before working on the natural gas system.
Vehicle diagnostic tester
Connecting and carrying out Guided Function
“Releasing pressure in the natural gas high-pressure line”
.
Note
Observe safety precautions when working on natural gas system
Chapter
.
The fuel tank 1 is removed together with fuel tank 2.
Observe rules for cleanliness
Chapter
.
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
.
Remove high-pressure lines from connections.
Position
engine and gearbox jack
V.A.G 1383 A
1
below support of fuel tanks
2
.
Release fuel tank support on both sides
arrows
.
Slowly lower
engine and gearbox jack
V.A.G 1383 A
.
Release securing straps of fuel tanks
arrow
.
If one tank or the tank shut-off valve is to be exchanged, empty tank
Chapter
.
Note
When the fuel tanks have to be stored temporarily, use
bracket
T10351
for this purpose.
Installing
Fitting instructions:
To screw on the fuel tank support, on vehicles with towing bracket the cover cap in bumper must be removed.
Adjust position of towing bracket so that bolting points are aligned correctly.
On vehicles without towing bracket the rear bumper must be removed
Rep. gr.
63
.
Specified torque
Component
Specified torque
Securing bolt of securing strap
15 Nm
Fuel tank support
50 Nm + 90° (1/4 turn) further. Always renew bolts after removal.
High-pressure line to union (counterhold on union with a spanner)
First tighten hand-tight then turn 90° (1/4 turn) further