Checking and converting adapter for back pressure test on natural gas tank, solenoid secured with securing nut — VW

Checking and converting
adapter for back pressure test on natural gas tank
, solenoid secured with securing nut
WARNING
Before using the
adapter for back pressure test on natural gas tank
, always check if it is the latest version.
Older versions of the
adapter for back pressure test on natural gas tank
must not be used unless converted accordingly.
The only adapter that may be used is the
adapter
V.A.G 1274B/12 A
. All other adapters need to be converted accordingly.
Adapters with pressure relief valve need to be retrofitted
Fig.
.
Distinguishing between different versions
Anchor
.
Converting
adapter for back pressure test on natural gas tank
Anchor
.
Distinguishing between different versions:
A
Old version without pressure relief valve in connection piece
2
B
Adapter
V.A.G 1274B/12 A
new version with pressure relief valve in connection piece
2
The older version
A
of the adapter has no pressure relief valve and needs to be converted. After connection piece
1
, a flexible hose is fitted.
The newer version
B
of the adapter is distinctly longer in area
2
. This is the area where the pressure relief valve is located.
Adapter
V.A.G 1274B/12 A-1
1
Protective cap
2
Threaded union for fuel tank shut-off valve
3
Connection piece
4
Pressure relief valve
5
Seal
Use
adapter
V.A.G 1274B/12 A-1
to convert from old to new version.
Converting from old to new version:
Observe safety precautions
Chapter
.
Observe rules for cleanliness
Chapter
.
Observe safety precautions when working on natural gas system
Chapter
.
Carefully loosen and unscrew union nut
2
.
When doing so, counterhold on union
2
with suitable tool.
Remove spacer ring from union
1
.
Insert filter strainer
2
into adapter
1
.
Insert the supplied seal
3
into adapter
1
.
Fit spacer ring
4
onto threaded piece of adapter
5
.
Screw
adapter
V.A.G 1274B/12 A-1
15
onto adapter
5
, and tighten to 20 Nm.
Counterhold using a suitable tool while doing so.
Connect converted
adapter for back pressure test on natural gas tank
to fuel tank shut-off valve.
Carry out leakage test
Chapter
.