CHEVROLET IMPALA 2016 10.G Bifuel Manual

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
10 Driving and Operating
Warning (Continued)
gas is ignited. If you suspect a
leak, do not start the engine or
drive the vehicle. Have the
vehicle immediately towed,
inspected, and repaired by an
authorized GM dealer.
Before filling either fuel tank, turn off
the engine.
The gasoline tank is filled through
the standard fill pipe. See “Filling
the Tank” under“Fuel” in the owner
manual.
The CNG fill receptacle is behind
the fuel door on the passenger side
above the gasoline cap.
Refueling Procedure
There are two methods of refueling:
fast fill or time fill. Fast fill is
normally used in fuel stations for
natural gas vehicles. It takes about
two to five minutes to fill up the fuel
tank. Time fill is done with a
refueling appliance, including
residential appliances, or a time-fill
post provided by the fleet operator.
Refueling time varies depending
upon the refueling system used —
consult with the refueling station
attendant or system provider.
Always observe all safety
recommendations and operating
instructions on the refueling
equipment. If a 24 800 kPa
(3,600 psig) nozzle is not available,
a 20 684 kPa (3,000 psig) nozzle
may be connected to the vehicle.
A fuel nozzle less than 7.6 cm (3 in)
long may be difficult to disengage
after dispensing CNG. During fueling, CNG needs to be
delivered to the vehicle at the
appropriate pressure in relationship
to the ambient temperature. This
can be done automatically by a
temperature compensation system
on the CNG fuel dispenser or
manually by stopping the CNG fill at
a recommended pressure related to
the ambient temperature
compensation chart. GM
recommends that customers use
CNG fueling stations that have a
temperature compensation system
whenever possible. Check with the
fuel station. If one is not available,
see the temperature compensation
chart that follows in this section to
choose the appropriate fill pressure
for the ambient temperature. In
addition, fill only to the pressure
level for the lowest ambient
temperature anticipated during
fueling.
Leaving a vehicle connected to a
time fill station can cause the tank
to be filled to a higher pressure than
recommended, especially when
outside temperatures fluctuate.
Disconnect the vehicle from the time

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Driving and Operating 11
fill station as soon as it is full,
unless an auto shutoff feature
is used.
{Warning
If CNG tanks are filled to a higher
pressure than recommended and
then exposed to a much higher
ambient temperature
environment, expansion of the
gas caused by the temperature
change may cause pressure relief
devices on the vehicle CNG
tank(s) to release gas, as
designed. If an ignition source is
present, this could create a risk of
fire or explosion. If there is any
possibility that the tank has been
over pressurized, take steps to
relieve the excess pressure, such
as by driving or running the
vehicle in an outdoor open area
to remove some fuel.Make sure that your CNG vehicle is
properly maintained and repaired to
avoid elevated temperatures
surrounding the tank, since elevated
temperatures in the area of the tank
could also raise the CNG pressure
in the tank.
Consult materials available from
NGVAmerica - http://www.ngvc.org
and the Clean Vehicle
Education Foundation -
http://www.cleanvehicle.org on CNG
fueling stations for more information.
Ambient Temperature / Maximum
CNG Fill Pressure Compensation
Chart
To avoid the risk of fire or explosion
if an ignition source were present,
do not fill above the pressure level
that corresponds to the lowest
ambient temperature expected
during fueling.
Service Pressure 24 800 kPa
(3,600 psig) at 21 °C (70 °F).

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
12 Driving and Operating
Depending on CNG fill station
equipment/performance, CNG fill
volume will vary. This will affect
overall vehicle range.Put the vehicle into P (Park) and
turn off the engine prior to refueling.
Remove the dust cap from the
receptacle, clean off any dirt or
debris on the receptacle, and followthe refueling instructions on the
pump or provided by the station
operator.
Refueling will stop automatically
when the tank is full. Wait for the
high pressure fuel to be purged from
the hose before disconnecting. See
the station operator for information
on how the line is purged. To
disconnect the vehicle from the
refueling station, remove the nozzle
from the fill receptacle.
A momentary release of CNG will
occur when the nozzle is released.
This is normal.
Put the fill valve dust cap on
securely and close the fuel
filler door.
If fuel or vapor is heard or seen
leaking from the nozzle-fill
receptacle connection, stop
refueling immediately. Dirt or other
debris may be preventing a positive
connection. Turn off the refueling
dispenser, disconnect the nozzle,
and inspect the fill receptacle for a
missing, damaged, dirty, or worn
O-ring. Reconnect the refueling

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Driving and Operating 13
dispenser to the fill valve and begin
refueling again. If a leak is still
present, replace the fill valve O-ring.
{Warning
Attempting to fill a CNG fuel
system that has a missing or
damaged O‐ring is dangerous.
Natural gas can leak. If the
natural gas is ignited, you or
others could be injured. Replace
the O‐ring before filling the tank.
Fill Valve O-RingTo replace the fill valve O-ring:
1. Carefully remove the O-ring from the groove in the fill
receptacle. A small flat-blade
or pointed tool can be used.
2. Make sure the groove is clean and free of dirt and debris.
3. Install the new O-ring in the groove in the fill receptacle.
Make sure the O-ring is
properly seated in the groove.
If a leak is still present after you
have replaced the O-ring, have an
authorized dealer inspect the
sealing O-ring in the fill receptacle.
If dirt or other debris is adhering to
the inside of the fuel fill receptacle,
gas may leak out after refueling.
If you need to add more fuel, repeat
the refueling procedure again.
See an authorized GM dealer for
replacement O-rings.
Fuel Filling Problems
If you experience very slow fill rates,
the CNG fuel filter in the fill valve
may require service. Slow fill rates
may also be caused by ice
formation on the fuel receptacle.
Use only CNG fuel meeting
recommended CNG fuel standards.
If you experience reduced range
during CNG operation and none of
the conditions described earlier in
this section apply, the CNG fuel tank
may require service. This may be
caused by the buildup of water, oil,
or debris inside the tank or an
inoperative tank valve. In either
case, take the vehicle to an
authorized GM dealer for service.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
14 Driving and Operating
Pressure Relief Devices
The CNG tank has pressure relief
devices that are designed to release
pressure if the CNG tank is
overheated or over pressurized.
If a pressure relief device releases
CNG, the CNG tank will be emptied
and will switch to gasoline,
if gasoline is available. A loud
rushing noise may be heard when
CNG is released.
In Case of a CNG Leak
If a CNG fuel leak is suspected, see
Fuel System Leak014.
Fuel System Leak
{Warning
Fuel vapors and fuel fires burn
violently and can cause injury or
death.
. Keep all smoking materials
and sources of ignition away
from the fuel system
components.
(Continued)
Warning (Continued)
.CNG is non-toxic but the
vapors are lighter than air
and can cause oxygen
depletion if they are
enclosed in a confined
space. Make sure there is
adequate ventilation and
use extreme caution if a
leak is suspected.
{Warning
If you smell a persistent natural
gas odor or hear a continual
hissing sound, there could be a
CNG leak. If the gas is
accidentally ignited, you or others
could be seriously injured or
killed. Do not start the engine or
drive the vehicle. Have the
vehicle towed to an authorized
GM dealer for service. A slight natural gas odor may be
detected for a few moments after
refueling. This is normal. You should
not be able to smell natural gas at
any other time. If you do, or if you
hear a hissing sound, the fuel
system may have a leak.
If natural gas is smelled or a hissing
sound is heard:
1. Park the vehicle in an outdoor open area and apply the
parking brake. Keep heat,
sparks, and flame away. Open
all the vehicle doors for
ventilation.
2. Turn the ignition to LOCK/OFF. Do not start the engine, refuel,
or drive the vehicle.
3. The manual shutoff is on the driver side of the vehicle in
front of the rear tire. See Fuel
System Components 017.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Driving and Operating 15
A label is on the outside of the
vehicle near the manual shutoff
valve. Do not remove this label.
Turn the lever one-quarter turn
clockwise to turn off.
Do not drive the vehicle. Have the
vehicle towed to an authorized GM
dealer for service.Trailer Towing
The vehicle is neither designed nor
intended to tow a trailer.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
16 Vehicle Care
Vehicle Care
General Information
Accessories andModifications . . . . . . . . . . . . . . . . . 16
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . . . 16
Fuel System Components . . . . . 17
Wheels and Tires
Tire Changing . . . . . . . . . . . . . . . . . 19
Jump Starting
Jump Starting - North America . . . . . . . . . . . . . . . . . . . . . . 19
Appearance Care
Exterior Care . . . . . . . . . . . . . . . . . . 20
General Information
Accessories and
Modifications
Adding accessories or making
modifications to the vehicle,
including to the CNG tank shields,
could cause damage and would not
be covered by the vehicle warranty.
If a CNG tank needs service or
repair, have only a qualified
technician perform the work. See
“Accessories and Modifications” in
the owner manual.
Vehicle Checks
Doing Your Own
Service Work
{Warning
Never try to do your own service
work on the Compressed Natural
Gas (CNG) fuel system. The CNG
fuel system operates under high
pressure. You can be injured and
the vehicle can be damaged if
you try to do your own service
work. Service and repair of this
system should only be performed
by a qualified dealer.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Vehicle Care 17
Fuel System Components
{Warning
Tampering with, or improperly
maintaining the high-pressure fuel
system can cause a dangerous
condition in which serious injury
or death may result. Never
attempt to modify the fuel system,
and always have the fuel system
repaired and maintained by a
qualified dealer.
CNG fuel system components
include the fuel tank in the trunk of
the vehicle, a fuel pressure
regulator, an in-tank fuel shutoff
valve, high pressure fuel lines,
electronically controlled multipoint
fuel injectors, and other equipment. CNG fuel system components
comply with appropriate safety
standards. Never modify or replace
any original CNG components or
parts with those specified for a
gasoline-powered vehicle. Improper
parts or components can damage
the vehicle fuel system and affect
the vehicle safety and performance.
Do not modify, tamper with,
or perforate the CNG tank shield.
Damage to the CNG fuel system
can result.
There is an identifying blue
diamond-shaped CNG label on the
rear of the vehicle. Do not remove
this label. This label is necessary for
compliance with NFPA-52 or CSA
B109 regulations. Driving without
this label may violate the laws or
regulations in some jurisdictions.
Replacement labels can be ordered
from your dealer.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
18 Vehicle Care
Manual Shutoff Valve
Locate the manual shutoff valve so
that it can be found quickly if it is
needed.
The manual shutoff valve is on the
driver side of the vehicle in front of
the rear tire.
A label is on the outside of the
vehicle near the manual shutoff
valve. Do not remove this label.To turn off the valve, turn the lever
one-quarter turn clockwise. Turn it
counterclockwise to turn the valve
back on.
Turn off the valve if a fuel leak is
suspected or the vehicle is involved
in an accident. This valve, when
turned, will stop CNG flow to the
engine.High Pressure CNG Fuel Filter
The high pressure CNG fuel filter is
under the rear of the vehicle. This
filter must have the water drained
and the filter element must also be
replaced at specific service
intervals. See
Maintenance
Schedule 021.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15
Vehicle Care 19
Low Pressure CNG Oil Separator
The low pressure CNG oil separator
is under the hood on the driver side
of the vehicle. This filter must have
the oil drained periodically. See
Maintenance Schedule021.
Wheels and Tires
Tire Changing
Storing a Flat Tire
{Warning
Storing a jack, a tire, or other
equipment in the passenger
compartment of the vehicle could
cause injury. In a sudden stop or
collision, loose equipment could
strike someone. Store all these in
the proper place.
1. Replace the foam, jack, and tools as instructed in the owner
manual.
2. Replace the floor cover.
3. Place the tire, lying flat, in the trunk.
Jump Starting
Jump Starting - North
America
{Warning
If the CNG fuel system has a
leak, a spark from the jumper
cables could ignite the natural
gas, causing injury or death. Do
not jump start the vehicle if you
smell a persistent natural gas
odor or hear a continual hissing
sound. Close the manual shutoff
valve, and have the vehicle towed
to an authorized GM dealer for
service. See Fuel System
Components 017.
See “Jump Starting - North America”
in the owner manual.