5
FIAT PUNTO LPG
The system extreme operat-
ing temperatures are between
-20°C and 100°C.
Selecting the type of fuel supply
The car is configured for running inde-
pendently on either petrol or LPG.
The engine is always started on petrol
with an automatic shift to LPG after about
40 seconds at the first significant acceler-
ation.
This is the time required to reach opti-
mum conditions (engine coolant temper-
ature, minimum revs level) for the switch
to LPG. As far as what has been said
is concerned, there must always be
some petrol in the tank (at least 1/4
full)in order not to compromise the op-
eration of the fuel pump. When running on LPG, when
the last red LED on gas quan-
tity indicator (visible on the
switch) comes on, refuelling is
advisable. If the LPG runs out during
LPG operation, the system automati-
cally switches to running on petrol
shown by: the amber LED coming on
constantly and the green LED flashing,
the fuel level LEDs going out and a
buzzer in the switch.
In addition, it is advisable to periodically
use up the petrol in the tank (until the re-
serve warning light comes on) in order to
ensure that the petrol does not become
old and possibly deteriorate.
The petrol/LPG switch A-fig. 1, located
on the protective fuse flap (left side of the
dashboard) allows the driver to select
petrol or LPG operation at their discre-
tion.
fig. 1F0M0472m
604.39.942 Grande Punto GPL GB.qxp:603.39.944 Grande Punto GPL IT 15-12-2008 9:00 Pagina 5
9
FIAT PUNTO LPG
SOLENOID VALVES
AND SAFETY DEVICES
The system has a solenoid valve located
on the pressure reduction unit and a so-
lenoid valve fitted inside the multivalve as-
sembly on the tank.
The main function of these solenoid valves
is to interrupt/allow the flow of LPG to
the supply circuit.
The solenoid valves are open when:
– a request to run on LPG has been made;
– the optimum engine conditions are sat-
isfied (engine coolant temperature, mini-
mum revs level) for running on LPG;– there is enough LGP in the tank for op-
eration;
The multivalve assembly fitted on the tank
includes:
– a valve that automatically stops the sup-
ply of LPG when the maximum permitted
filling level is reached (80% of the total
tank capacity);
– a flow limiter which, if a pipe is broken,
prevents the complete and sudden escape
of LPG;
– a one-way valve, located on the gas re-
turn pipe in the tank, which prevents LPG
reflux;
– a safety solenoid valve on the LPG sup-
ply, which either gives the go ahead or
prevents the escape of gas to the pressure
reduction unit; – a manual tap, upstream of the solenoid
valve, that separates the tank from the LPG
system to allow maintenance operations;
– a fuse pad which, in the case of over-
heating (temperature above 120°C), to-
tally eliminates the danger of excess pres-
sure making the LPG in the tank flow out
as quickly as possible in a controlled man-
ner;
– an analogue gauge showing the level of
LPG in the tank.
604.39.942 Grande Punto GPL GB.qxp:603.39.944 Grande Punto GPL IT 15-12-2008 9:00 Pagina 9
