2007 FIAT MULTIPLA fuel pressure

INTRODUCTION ....................................................................................... 3
FUNCTIONAL DIAGRAM OF THE SYSTEM....................................... 6
BOTTLES ....................................................................................................... 7
SOLENOID VALVE/SAFETY DEVICES ................................................... 8
PIPES ............................................................................................................... 9
PRESSURE REDUCER/REGULATOR ...................................................... 9
NATURAL GAS INJECTORS .................................................................... 9
NATURAL GAS ELECTRONIC CONTROL UNIT ............................ 9
NATURAL GAS/PETROL SWITCH ........................................................ 10
NATURAL GAS AMOUNT INDICATOR.............................................. 11
FUEL CUT-OFF SWITCH ......................................................................... 12
ENGINE STARTING ................................................................................... 12
TO THE FILLING STATION .................................................................... 13
IF A TYRE IS PUNCTURED....................................................................... 14
BOTTLE IDENTIFICATION DATA ........................................................ 15
BOTTLE INSPECTION .............................................................................. 15
SERVICE SCHEDULE................................................................................... 16
BODYWORK VERSION CODES ............................................................ 17
ENGINE ......................................................................................................... 17
FUEL FEED/IGNITION ............................................................................... 18
IGNITION ..................................................................................................... 18
COOLING SYSTEM .................................................................................... 18
PERFORMANCE........................................................................................... 18
WEIGHTS....................................................................................................... 19
DIMENSIONS ............................................................................................... 20
FUELLING AND FILLING ......................................................................... 21
FUEL CONSUMPTION .............................................................................. 22
CO
2 EMISSIONS.......................................................................................... 23
FUSES .............................................................................................................. 23
This enclosure deals with the Fiat
Multipla petrol-natural gas version.
Refer to the Fiat Multipla Owner
Handbook for any subject not covered
by this supplement.
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4
Selecting the type of fuel feed
The Natural Power Fiat Multipla has been designed to be normally fuelled
by natural gas.
When the natural gas is running out and the pressure inside the bottle is
nearing the limit of correct operation, switching to petrol fuelling will
take place automatically.
The engine will always be started by petrol fuelling (in order to keep this
type of feed efficient), with automatic switching to natural gas fuelling
after a few seconds.
For this reason, petrol should always be found in the tank.
The control button located on the dashboard (A), represented by
ideograph K, makes it possible to select petrol fuelling. Automatic
switching to natural gas fuelling will not take place in case petrol has run
out.
Manual selection of the operating mode will be actuated only if the
engine speed is lower than 2,000 rpm.
F0E0500m
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5
reduced to non-hazardous values) and excessive
temperature (a fuse plugnut allows natural gas to be
discharged as fast as possible when the temperature
exceeds 110°C).
The solenoid valve is connected to the Fire
Protection System (inertia switch or fuel cut-off
switch).
Active safety
The Natural Power Fiat Multipla features the same ac-
tive safety characteristics as the other versions. Passive safety
The Natural Power Fiat Multipla features the same
passive safety characteristics as the other versions.
In particular, the natural gas bottle position and
mounts have been designed so as to pass the crash
tests in accordance with the Fiat safety standards.
The flow of the natural gas coming out of the bottle is
regulated by a solenoid valve that is open only when
the engine is fuelled by natural gas.
The solenoid valve unit includes the protections in
case of excessive flow (in the event that the high
pressure system is broken, the natural gas flow will be
WARNINGThe Natural Power Fiat Multipla is equipped with a high-pressure natural gas
system designed to operated at 200 nominal bar.
It is dangerous to force the system with higher pressures. When the vehicle has to
be towed or lifted, strictly follow the instructions of the basic handbook (refer to
“Towing the vehicle”), to avoid damaging the natural gas system components.
In case of natural gas system failure, contact the Fiat Dealership only.
Do not modify the natural gas system configuration or components: they have
been especially designed for Natural Power Fiat Multipla only. Using other
components or materials may cause vehicle malfunction and affect the vehicle’s
safety. In case of “furnace” painting, the bottles shall be removed from the vehicle
and subsequently fitted back into place by the Fiar Dealership.
Although the natural gas system is equipped with various safety devices, it is
recommended that the manual tap of every single bottle is turned off every time
the vehicle is either put away for a long time or transported on other vehicles or
operated in emergency situations following a failure or accident.
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13
AT THE FILLING STATION
NATURAL GAS FILLING PIPE UNION
The natural gas filling pipe union (B) is located next to the petrol pipe
union and can be accessed by opening the fuel lid.
It is equipped with a dual “non-return” valve: one fitted into the pipe
union body itself; one located next to the bottle, at the start of the filling
pipe.
To gain access to pipe union (B), unscrew cap (A).
The contour of pipe union (B) is of the “multi-purpose” type.
During filling up, natural gas pipe union cap (A) can be positioned directly
on the lid, as illustrated.
In certain European States, the adaptors are considered ILLEGAL (e.g.
Germany).
In the case of service stations equipped with m
3gas guns (with dissolved
air pressure) so as to verify the residual pressure in the gas bottle, the
non-return valves must be unblocked by supplying a small quantity of
Methane.
The other plates (delivered with the vehicle documents) indicate the
expected date for the first testing/inspection of the gas bottles.
The employees assigned to the Methane supply are not authorised to fill
the gas bottles with the test date expired.
F0E0507m
F0E0508m
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16
PREVENTIVE MAINTENANCE SCHEDULE
Supplementary operations to the Maintenance Schedule described in the Owner Handbook
thousand kilometres
Cold cylinder compression check
Visually inspect the conditions of natural gas
pipes and fittings, natural gas tank fastening,
resume, if necessary*
Check the pressure regulator and
replace the internal filter, if necessary*
Check the fuel feed system functioning and parameters
by means of the self-diagnosis connection
Check the tightening torque of the
bottle fastening straps
*or every 12 months
20 40 60 80 100 120 140 160 180
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●● ● ● ● ● ● ● ●
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18
FUEL FEED (Natural gas)
Electronic injection specific to the natural gas.
Type: Sequential, timed Multipoint injection.
Injection pressure: approximately 9 bar.
Stoichiometric metering of the air/natural gas mixture.
The natural gas injection system is controlled by a
special control unit by making use of the sensors
previously fitted to the vehicle, including the oxygen
sensor for fuel metering control.
IGNITION
Electronics with static advance integrated with
injection.ENGINE COOLING
Engine cooling system with branching-off to bring hot
fluid in contact with the pressure reducer (which is
subject, during its operation, to heavy cooling).
PERFORMANCE
Maximum speeds in the 5
thgear (kph):
petrol fuelling: 168
natural gas fuelling: 157
Any modification or repair made to the fuel feed system in a wrong way and
without considering the technical features of the system may cause operating
anomalies with a risk of fire.WARNING
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21
FUELLING AND FILLING
Person transport version
Petrol .................................................................. litres 38
❐ including a reserve of .................................. litres 5
Natural gas (*)
❐ bottle ................................................................ litres 164
❐ Natural gas (*) ............................ m338.9 (kg 26.49)
(*) Natural gas in standard conditions: 15°C; 1.013 bar; density: 0.680
kg/m3.
IMPORTANT! Please be reminded that when natural
gas is used to fuel the vehicle, the fuel distance may
vary to some extent since it depends on the vehicle
maintenance and driving conditions as well as the
temperature of the gas in the bottle.
In fact, natural gas heats up when it is filled and cools
when the vehicle is running, thus undergoing pressure
variations that reduce the amount of gas that can be
used.ENGINE OIL
IMPORTANT! As regards the engines powered by
alternative fuels (natural gas), a multigrade engine oil
shall be used, which shall feature very high fluidity,
grade: SAE 5W30, specifications ACEA A1-A5 - API SL
and FIAT 9.55535-M1.
Therefore, it is recommended that you use the
SELENIA PERFORMER MULTIPOWER oil.
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