2008 FIAT GRANDE PUNTO engine

3
FIAT PUNTO LPG
The Fiat Punto LPG version (Petrol-LPG)
is dealt with in this appendix.
For anything not included in this Supple-
ment, refer to the Owner Manual en-
closed.INDEX
KNOWING YOUR CAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SYSTEM FUNCTIONAL DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LPG TANK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SOLENOID VALVES AND SAFETY DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
REGULATION UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PAPER FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
LPG INJECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ELECTRONIC CONTROL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
LPG/PETROL SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FUEL CUT-OFF SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
STARTING THE ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
AT THE FILLING STATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
WHEELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
FUSE REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SCHEDULED SERVICING PLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
WEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
LUGGAGE COMPARTMENT VOLUME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
WHEELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CAPACITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CO
2EMISSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
FUEL CONSUMPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
604.39.942 Grande Punto GPL GB.qxp:603.39.944 Grande Punto GPL IT 15-12-2008 9:00 Pagina 3

4
FIAT PUNTO LPG
KNOWING YOUR CAR
Introduction
The LPG version of the car features two
fuel systems: one for petrol and one for
LPG.
Like the petrol system, the LPG system
is the phased, sequential multipoint type
with special injectors.LPG Multipoint injection system
This product is produced in strict collab-
oration with prestigious suppliers in the
LPG sector.
The injection system used on the car is an
efficient system in terms of engine per-
formance and is based on the injection of
LPG in a gaseous state.
In this system with four injectors, one for
each intake manifold, the fuel is injected
directly into the engine heat transfer ducts
thereby metering the LPG very precisely
improving combustion and, at the same
time, excluding any possibility of flame re-
turn.
By adapting the electronic control tech-
nology of petrol engines to meet the spec-
ifications of LPG, it has been possible to
achieve important results in terms of dri-
veability and controlling exhaust emissions.
Engines running on LPG have almost the
same torque/power specifications as when
running on petrol and, as a result, the per-
formance of the car is also comparable. What is LPG?
LPG (the abbreviation of liquefied petro-
leum gas) is a mixture of gas used as an
economical and safe primary energy
source.
Its main components are: propane gas and
butane gas mixed.
These gases are a product of petroleum
refinement and are also present naturally
in oil fields and methane-producing de-
posits.
In its natural state this mixture is in a
gaseous state but, as the pressure in-
creases, at ambient temperature, it can
easily be turned into a liquid state.
LPG is a fuel with a low environmental im-
pact because it reduces the pollution pro-
duced by vehicle exhaust gases.
604.39.942 Grande Punto GPL GB.qxp:603.39.944 Grande Punto GPL IT 15-12-2008 9:00 Pagina 4

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

6
FIAT PUNTO LPG
When painting in an oven, the
LPG tank should be removed
from the car and later care-
fully refitted by a Fiat Dealer.
Although the LPG system has numer-
ous safety features, it is advisable to
close the manual tap on the tank every
time the car is not in use for a long pe-
riod, transported on other vehicles or
moved in an emergency as a result of a
breakdown or accident.
Active safety
The car has the same active safety speci-
fications as other versions.
The Fiat Punto LPG is equipped
with gaseous LPG injection
system designed specifically
for the car: it is therefore
strictly prohibited to alter the config-
uration of the system and components.
The use of other components or ma-
terials could cause malfunctions and
lead to a reduction in safety therefore,
in the case of problems, go to a Fiat
Dealer. When towing or raising the
car, to prevent damage to the gas sys-
tem parts, follow the instructions in the
Owner Handbook in the “Towing the
car” chapter.
It should be pointed out that
in some countries (including
Italy) there are legal restrictions in
force for parking/garaging motor ve-
hicles with gas that has a higher den-
sity than air; LPG comes under this
category.
WARNINGPASSIVE SAFETY -
ACTIVE SAFETY
Passive safety
The car has the same passive safety spec-
ifications as other versions. In particular,
the tank mountings (located in the spare
wheel housing) have been designed to ex-
ceed the Fiat safety standards for impact
tests.
When running on LPG, the flow of gas (in
a liquid state) leaving the tank, passes
through the dedicated pipe to the pres-
sure regulator where there is a safety so-
lenoid valve that stops the flow of LPG
when the key is turned off or when a
change of fuel is selected by the driver (de-
cision to run on petrol).
Together with the regulator solenoid
valve, a second solenoid valve, in the tank,
closes the LPG pipe at the tank outlet.
The two solenoid valves are closed in the
case of an impact after which the engine
cuts out caused by the fuel cut off system.
The LPG tank meets the legal safety stan-
dards of the countries in which the ver-
sion illustrated this Supplement is mar-
keted.
604.39.942 Grande Punto GPL GB.qxp:603.39.944 Grande Punto GPL IT 15-12-2008 9:00 Pagina 6

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

10
FIAT PUNTO LPG
REGULATION UNIT
The regulation unit fig. 4includes:
– cut out solenoid valve with gauze filter;
– pressure regulator.
The cut out solenoid valveopens or
closes together with the solenoid valve on
the tank. It closes each flow of LPG when
the engine is not running on gas.
It also acts as a safety device that prevents
the flow of LPG if the inertia switch is ac-
tivated.
fig. 4F0M0475m
The pressure regulatorallows the
change of the LPG from a liquid state to a
gaseous state via a dilation chamber and
maintains the pressure required for the op-
eration of the system at a preset value.
PIPING
The piping for the LPG in a liquid state
(from the filler to the tank and from the
tank to the pressure regulator) is made
from copper and coated in plastic.
The piping for the LPG in a gaseous state
(from the pressure regulator to the LPG
injectors) is made from rubber.
604.39.942 Grande Punto GPL GB.qxp:603.39.944 Grande Punto GPL IT 15-12-2008 9:01 Pagina 10

12
FIAT PUNTO LPG
ELECTRONIC CONTROL
UNIT
The vehicle has a dedicted electronic con-
trol unit for the LPG system; it uses the
incoming signals from the petrol injection
control unit and converts them into sig-
nals for the injection of the LPG.
The control unit for the injectors has the
same strategy as the petrol control unit
(phased, sequential, multipoint).
LPG/PETROL SWITCH
The LPG/petrol switch fig. 7is located on
the protective fuse flap (left side of the
dashboard) and includes:
A. LPG/petrol operating mode request
button;
B. LPG gauge: 5 LEDs, 4 green and 1 red
to indicate the reserve. The red LED on-
ly comes on when the last green LED goes
out.
The red LED indicates the reserve con-
dition;
ON. LPG operating mode indicator:
green LED, located under button A, on
constantly;
OFF. petrol operating mode indicator:
yellow LED, located above button A, on
constantly.
IMPORTANT When the ignition key is
turned to the MARposition the LEDs on
the ignition switch come on in accordance
with the following logic:
– with the petrol operating mode se-
lected: yellow OFFLED on;
– with the LPG operating mode se-
lected: all the LEDs in the switch are on
constantly and the green ONLED is flash-
ing. To select the type of fuel system desired
(LPG or petrol), press the button A-fig.
7.
To change the type of fuel system, it is ad-
visable to operate the button with the ve-
hicle stationary and the engine running or
,whilst driving, after having released the
accelerator.
If the switching takes place during accel-
eration or pick-up, there may be a brief
flat spot (fall in power).
fig. 7F0M0478m
Do not switch between the
two operating modes whilst
starting the engine.
604.39.942 Grande Punto GPL GB.qxp:603.39.944 Grande Punto GPL IT 15-12-2008 9:01 Pagina 12

13
FIAT PUNTO LPG
Switching from petrol to LPG
When running on petrol: press the button
A-fig 7, the switch to LPG will take place
automatically at the first significant accel-
eration.
During switching:
– the LPG gauge Bcomes on;
– the yellow OFFLED goes out (petrol
operating mode);
– the green ONLED comes on switch-
ing from intermittent to on constantly
(LPG operating mode);
There is a series of 5 LEDs B(1 red and
4 green) on the left side of the switch that
display the amount of LPG in the tank.
When the amount of LPG remaining goes
below about 1/5 of the capacity of the
tank, only the red (reserve) LED remains
on to signal the need for refuelling.
IMPORTANT In the case of starting at
outside temperatures of below -10°C, the
switching times from petrol to LPG in-
crease to allow the pressure regulator to
become warm enough.IMPORTANT The buzzer warns the dri-
ver that the engine is running on petrol;
therefore they must refuel with LPG be-
fore it runs out.
It is possible to deactivate the buzzer by
pressing switching button A.
Do not switch between the
two operating modes whilst
starting the engine.Switching from LPG to petrol
When running on LPG: press the button
A-fig. 7.
During switching:
– the LPG gauge Bgoes out;
– the yellow OFFLED comes on con-
stantly (petrol operating mode);
– the green ONLED goes out (LPG op-
erating mode).
LPG used up
If the LPG runs out, switching to petrol
takes place automatically with:
– the yellow OFFLED on constantly;
– the green ONLED flashing;
– an acoustic warning from the switch
buzzer (fast frequency).
604.39.942 Grande Punto GPL GB.qxp:603.39.944 Grande Punto GPL IT 15-12-2008 9:01 Pagina 13