Fiat 500 Owner's Handbook Manual page 40

WARNING
25) The system operates at temperatures
ranging between −20°C and 100°C.
26) The car is equipped with a gaseous
LPG injection system designed specifically
for it: it is therefore absolutely forbidden
to alter the configuration of the system or
its components. The use of other
components or materials could cause
malfunctions and lead to a reduction in
safety; therefore, in the case of problems,
contact a Fiat Dealership. To prevent
damage to the gas system parts when
towing or raising the vehicle, follow the
instructions in the "Towing the vehicle"
paragraph of the Owner Handbook.
27) When painting in an oven, the LPG
tank must be removed from the car and
later refitted by a Fiat Dealership. Although
the LPG system has numerous safety
features, it is advisable to proceed
as follows every time the vehicle is not in
use for a long period or moved in an
emergency as a result of a breakdown or
accident: unscrew the fastening devices A
fig. 41, then remove the cover B. Close
the LPG cock rotating the ring nut C
clockwise fig. 42; refit the cover and tighten
the fixing devices.
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28) Periodically (at least once every six
months), it is advisable to let the LPG in the
tank run out and, at the next refuelling,
check that it does not exceed the
maximum capacity of 30.5 litres (reserve
included) (with a tolerance of 2 litres
excess) (see instructions in the "Capacities"
paragraph). If the level is above 30.5 litres
(reserve included) contact a Fiat Dealership
immediately.
29) In particular usage conditions, such as
starting and operation at low ambient
temperature or LPG supply with low
propane content, the system may switch
temporarily to petrol operation, without
a visual indication of switching on the
selector. If the level of LPG in the tank is
low or there is a request for high
performance (e.g. overtaking, car fully
laden, steep hills): the system can
automatically switch to petrol operation to
guarantee the required engine
performance; in this event, the performed
switching is shown by the orange (petrol)
LED lit and the green (LPG) LED off on the
switch. When the above conditions stop,
the system automatically restores the LPG
operation; the orange (petrol) LED turns
off and the green (LPG) LED is lit on the
switch. To achieve the automatic switching
described above, make sure that there is
always enough fuel in the petrol tank.
30) It is strictly forbidden to use any
additive in the LPG.