8
FIAT FIORINO/QUBO NATURAL POWER
PIPING
The methane piping from the filler to the
pressure regulator/reduction unit is made
from galvanised steel and covered in plas-
tic (high pressure) and is located outside
the passenger compartment; the piping
from the pressure regulator/reduction
unit to the methane injectors is in stain-
less steel.
PRESSURE REGULATOR/
REDUCTION UNIT
The pressure reduction unit Fig. 8is in-
stalled in the engine compartment.
It has the task of reducing the pressure
of the methane from the value in the cylin-
der to the supply value for the methane
injectors (about 6 bar) and of keeping it
constant in all operating conditions.
METHANE INJECTORS
There are 4 dedicated injectors for the
methane gas A-Fig. 9, fitted on the intake
manifold near the cylinder head, one for
each intake duct; they are supplied at a
constant pressure (about 6 bar) and op-
erated by the electronic control unit.
PETROL/METHANE
SWITCH
This engine normally runs on methane ex-
cept during starting when it runs on petrol.
Switching to methane takes place auto-
matically and is shown on the instrument
panel display by the Ksignal in the display
Fig. 11going out.
Fig. 9F0T0351m
Fig. 8F0T0350m
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9
FIAT FIORINO/QUBO NATURAL POWER
The four vertical bars near the letters
CNG in the instrument panel display
Fig. 11indicate the level of methane in
the cylinders.
When the residual amount of methane
goes below 1/5 of the capacity of the cylin-
ders, the CNG icon and the lowest level
Fig. 12flash to indicate the reserve and
notify the need to refuel.
If the methane has run out, the switch to
petrol operation takes place automatical-
ly: the Ksymbol near the CNG icon
Fig. 11in the instrument panel display
comes on.
If you specifically wish to run on petrol,
press the dedicated button Fig. 10locat-
ed between the controls in the dashboard.
The LED in the button coming on means
that the request to switch has taken place
correctly.
Fig. 10F0T0343m
Fig. 11F0T0358m
Fig. 12F0T0359m
If the last fuel system in use
was petrol, when starting the
switch to methane shall be re-
quested manually by the customer.
Manual switching of the operat-
ing mode from petrol to meth -
ane and vice versa is only acti-
vated if the engine speed is below
2000 rpm.
At the time of the switching
request there will be a
metallic noise coming from the valves
to pressurise the circuit (more obvi-
ous with the ignition key in the MAR
position). As a result of the switching
logics described above, ithe delay be-
tween the ticking of the valve and the
display switching off on the instru-
ment panel is entirely normal.
IMPORTANT
The actual change to the chosen fuel sys-
tem takes place depending on the vehicle
usage conditions to guarantee switching in
absolute safety and will be confirmed by
the Kwarning light in the instrument pan-
el display coming on/going off.
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10
FIAT FIORINO/QUBO NATURAL POWER
Do not switch between the
two operating modes during
engine start-up.
IMPORTANT
In addition, when starting at outside tem-
peratures of below –10 °C, the switching
times from petrol to methane increase to
allow the pressure regulator/reduction
unit to heat up.
IMPORTANT If switching takes place dur-
ing acceleration or pick-up, there may be
a brief flat spot (drop in power).STARTING THE ENGINE
To carry out the starting manoeuvre cor-
rectly, see the warnings and advice in the
Owner Handbook under the chapter
Starting the engine”.
FUEL CUT-OFF SYSTEM
In the event of an impact to the car, the
petrol and injection supply is cut off im-
mediately, causing the engine to cut out
and, as a result, the safety solenoid valves
to close.
For further information, see the Fuel cut-
off system” paragraph in the Controls”
chapter in the Owner Handbook.
PROTECTION FUSES
The CNG system components are pro-
tected by specific fuses. Contact a Fiat
Dealership if a fuse needs replacing.
If the methane has run out, the control
unit automatically manages the switch to
running on petrol.
SYSTEM FAILURE SIGNALLING
With the multifunction display, any system
failure is signalled through a dedicated mes-
sage and, at the same time, by the CNG
icon and the four methane levels flashing
(with solid bars). In this case, contact a
Fiat Dealership as quickly as possible.
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