Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Driving and Operating 9
standards for general marketplace
vehicle usage; however, CNG is
available at both private and public
filling stations. We recommend use
of CNG that meets or exceeds SAE
J1616 specifications for fuel
composition and cleanliness. See
Filling the Tank (CNG)09.
Caution
Using below standard CNG fuel
quality may cause damage to the
CNG fuel system. Use only CNG
fuel meeting recommended CNG
fuel standards.
The main component of CNG is
methane, a highly flammable,
colorless gas. An odorant has been
added for detection through smell.
The smell is similar to that of rotten
eggs. The CNG in the vehicle is
stored under high pressure
(maximum 24 800kPa at 21 °C/
3,600 psig at 70 °F). Gas should
never be smelled unless it occurs
briefly during refueling. If gas is
smelled or a hissing sound is heard
at any other time, park in a well ventilated outdoor open area, shut
down the vehicle, and have it
serviced.
It may be possible to hear the fuel
flowing while the engine is running if
standing close to the pipework or
various fuel system components
(regulator, filter). This is normal and
should not be confused with a
hissing sound at fittings that may
indicate a fuel leak. If you suspect a
fuel leak, follow the instructions
under
Fuel System Leak 014.
Fuel Selector Switch
The fuel selector switch is on the
instrument panel left of the steering
wheel. When the ignition is in ON/
RUN, press
0to select between
gasoline and CNG. The indicator
light in the fuel selector switch
comes on when the vehicle is
running on CNG.
Certain conditions must be met in
order to switch between gasoline
and CNG. The vehicle will start up
on the last fuel that was selected.
When the fuel selector switch is
pressed, the indicator light will flash
during a fuel transition. If the fuel
transition is unsuccessful, the DIC
will display FUEL MODE
UNAVAILABLE. See Fuel System
Messages 06.
Filling the Tank (CNG)
{Warning
CNG is flammable and highly
explosive. You could be killed or
seriously injured if leaking natural
(Continued)
