7
FIAT PUNTO NATURAL POWER
3) Excess flow,it intervenes if the piping
is broken limiting the flow of methane to
values that are not dangerous.
The flow restricter valve is located to al-
low it to operate even if the solenoid valve
casing is broken due to an impact.
4) Manual tap,it is located upstream of
the solenoid valve.
SOLENOID VALVES/
SAFETY DEVICES
The solenoid valves Fig. 5and Fig. 6are
bolted directly onto the methane canis-
ters with the main function on interrupt-
ing the flow of methane to the supply cir-
cuit.
The solenoid valves are open when:
❒the switching button is in the methane
position;
❒the pressure in the canister is sufficient
for operation;
❒the engine is running;
❒the inertia switch has not been trig-
gered.
The solenoid valve assembly is equipped
with the following safety devices:
1) Fuse pad,in the case of overheating
(temperature above 110 °C), it totally
eliminates the danger of excess pressure
making the methane in the canister flow
out as quickly as possible in a controlled
manner.
2) Mechanical excess pressure device
(Burt Disk),in the case of excess pres-
sure (above 330 bar), it ensures that the
methane escapes as quickly as possible in
a controlled manner.It separates the canister from the methane
system to allow maintenance operations.
The taps are accessible from outside the
car and are located, in the case of the
lengthwise centre canister, at the rear of
the canister and, in the case of the trans-
verse rear canister, towards the right
wheel side.
To close the taps D-Fig. 7: turn the knob
in the direction (1) shown by the arrow
(clockwise
OFF)
To open the taps D-Fig. 7: turn the knob
in the direction (2) shown by the arrow
(anti-clockwise
ON)
5) Single-acting valve,this prevents the
methane from flowing back to the filler.
fig. 5F0M0454m
fig. 6F0M0455m
fig. 7
D
1
2
F0M0456m
603_97_125 Punto Nat P GB 1ed 6-05-2009 10:14 Pagina 7
11
FIAT PUNTO NATURAL POWER
FUEL CUT OFF SWITCH
The safety switch is triggered in the case
of an impact, cutting off the methane sup-
ply and causing the engine to cut out.
For further information, see the “Fuel cut
off switch” paragraph in the “Controls”
chapter in the Owner Handbook.
AT THE
FILLING STATION
METHANE GAS FILLER
The methane filler is located near the
petrol one Fig. 14.
It is comes complete with a “single-acting”
valve: fitted in the actual filler casing.
To access the filler, undo the cap A - Fig.
15turning it anti-clockwise.
The profile of the filler
Bfor refilling is the
universal type compatible with Italia and
NGV1 standards.
In some European countries adaptors are
considered ILLEGAL (e.g. in Germany).
In the case of service stations with m
3(dif-
ferent pressure) nozzles, to measure the
residual pressure in the canister, the sin-
gle-acting valves must be undone supply-
ing a small amount of methane.
fig. 14F0M0463m
The other plates (handed over with the
car documentation) contain the date for
the first canister inspection.
Those responsible for the methane supply
are not authorized to refill the canisters
when the inspection date has expired.
fig. 15F0M0464m
603_97_125 Punto Nat P GB 1ed 6-05-2009 10:14 Pagina 11
