This owner’s manual should be
considered a permanent part of the
vehicle and should remain with the
vehicle when it is sold.
The inf ormation and specifications
included in this publication were in
effect at the time of approval for
printing. Honda Motor Co., Ltd.
reserves the right, however, to
discontinue or change specifications
or design at any time without notice
and without incurring any obligation
whatsoever.
Your Civic GX runs on compressed
natural gas (CNG), a highly
pressurized version of the same
clean-burning natural gas used in
many homes.
Your Civic GX operates and
performs like a gasoline-powered
Civic. However, there are a few
diff erences you should be aware of .
In addition to reading the Civic
Sedan owner’s manual, please read
this supplement carefully to
understand the operation and unique
features of your Civic GX.
2
You will f ind important safety
information in this supplement and
in the owner’s manual. This
information alerts you to potential
hazards that could hurt you or others.
Please read it carefully.
06/08/10 20:16:19 31SNF910 0004
MALFUNCTION INDICATOR LAMP
Instrument Panel Indicators
Malfunction Indicator
Lamp
This indicator comes on for a few
seconds when you turn the ignition
switch to the ON (II) position. If it
comes on at any other time, it
indicates one of the engine’s
emissions control systems may have
a problem. For complete inf ormation,
refer to the Civic Sedan owner’s
manual.
This indicator will also come on if
there is a problem in the fuel system.
If this happens, have the vehicle
checkedbyanauthorizedHonda
Civic GX dealer as soon as possible.
Drive moderately until the dealer has
inspected the problem. Avoid fullthrottle acceleration and driving at
high speed.
CONTINUED
Instruments and Controls
3
06/08/10 20:16:25 31SNF910 0005
Instrument Panel Indicators
If you smell natural gas or hear a
hissing sound, except when refueling,
the fuel system may have a leak.
Follow the instructions under
Fuel System Has a Leak
of this supplement.
29
4
Instruments and Controls
If the
on page
Low Fuel Indicator
LOW FUEL INDICATOR
This indicator comes on for a few
seconds when you turn the ignition
switch to the ON (II) position. It also
comesonasareminderthatyou
must ref uel soon. The approximate
driving distance remaining when this
indicator comes on is:
City driving20--25 miles
Highway driving25--30 miles
−
−
As the temperature of the outside air
cools, the temperature inside the
tank begins to drop, and the
pressure inside the tank drops too.
This means that when the outside air
gets very cold [below 25°F ( 4°C)],
−
the pressure of the natural gas inside
the tank goes down, and the fuel
gauge may indicate that you have
less fuel than what actually remains
in the tank. Keep this in mind if the
low fuel indicator comes on while
youaredrivingincoldweather.
If this indicator starts blinking and
the fuel level reading goes down to
empty when the engine is running, it
indicates a problem in the fuel
system. Have the vehicle checked by
an authorized Honda Civic GX dealer
as soon as possible.
06/08/10 20:16:32 31SNF910 0006
Gauges, Rear Seat
Fuel GaugeRear Seat
LOWER ‘‘F’’ MARK
The gauge may show slightly more
or less than the actual amount. The
tank temperature, fill method, and
UnlikethestandardCivic,theseat-
back cannot be folded down.
ambient conditions may affect the
pressure and temperature of the
natural gas.
UPPER ‘‘F’’ MARK
FUEL GAUGE
This gauge shows how much f uel
you have. The quantity of fuel
remaining in the tank is calculated
based on the pressure and
temperature of the natural gas in the
fuel tank.
The lower ‘‘F’’ mark indicates a full
tank at a fill pressure of 3,000 psi.
The upper ‘‘F’’ mark indicates a full
tank at a fill pressure of 3,600 psi.
Instruments and Controls
5
06/08/10 20:16:37 31SNF910 0007
Fuel
Your Civic GX is designed to operate
on compressed natural gas (CNG).
The natural gas you use to refuel
must meet NFPA-52 and SAE J1616
standards for fuel composition and
quality.
If you use a fuel that does not meet
these standards, you may feel a
decrease in engine power and your
vehicle’s emissions controls may be
damaged.
6
Before Driving
Compressed Natural Gas (CNG)
The main component of compressed
natural gas is methane, a highly
flammable, colorless gas. While it is
the same gas that is burned in
everyday home appliances such as
kitchen stoves and water heaters,
theCNGinyourvehicleisstored
under high pressure (maximum
3,600 psi/24,800 kPa).
The CNG system in your vehicle,
including the tank and hoses, has
been designed to hold gas at this
pressure. It has also been tested for
safety. You should never smell gas
or hear a hissing sound unless you
are ref ueling. If you smell gas or
hear a hissing sound at any other
time, you need to shut down the
CNG system. Follow the instructions
on page.12
Compressed natural gas is
flammable and highly explosive.
You could be killed or seriously
injured if leaking natural gas is
ignited.
If you suspect a leak, have your
vehicle immediately inspected
and repaired by an authorized
Honda Civic GX dealer.
06/08/10 20:16:48 31SNF910 0008
Fuel, Refueling Procedure
CNG Identif icationRef ueling Procedure
CNG LABEL
Your vehicle has an identifying
‘‘CNG’’ label attached next to the
rear license plate. Do not remove
this label. This label is necessary for
insuring your vehicle. Driving
without this label may violate the
laws or regulations in some states.
There are two methods of refueling,
fast filling or slow filling.
Fast filling is normally used in fuel
stations for natural gas vehicles. It
takes about 3 to 5 minutes to fill up
the fuel tank.
Slow filling is done with a vehicle
refueling appliance. Refueling takes
about 1 hour per gasoline gallon
equivalent.
Always observe all safety
recommendations and operating
instructions on the refueling
equipment.
When refueling, you should use a
fuel fill nozzle that complies with
ANSI/AGA NGV-1-1994 standards.
Nozzles are designed according to
their maximum fill pressure: P24 for
2,400 psi (pounds per square inch),
P30 for 3,000 psi, and P36 for 3,600
psi.
Your vehicle’s maximum f ill pressure
is 3,600 psi (24,800 kPa), so you
should refuel with a P36 nozzle.
Using a P30 nozzle will fill the tank
to the second (3,000 psi) fill mark on
the fuel gauge. Using a P24 nozzle
will not fill the tank completely.
During a fast fill, the natural gas is
warmed by the refueling process.
This causes the pressure in the tank
to rise and reduces the amount of
fuel you can put in.
The label shown below is attached to
the fuel receptacle lid.
WARNING
CONTINUED
Before Driving
7
06/08/10 20:16:56 31SNF910 0009
Refueling Procedure
Using f ast f ill equipment at
temperatures below 4°F ( 16°C) may
−
damage the f uel system, potentially
causing a leak. Only use slow f ill
equipment when ambient temperatures
are below 4°F ( 16°C).
−
Filling the Fuel Tank
The refueling equipment and
procedure can vary with the
refueling station. The CNG fill
nozzle may not look or work like the
example on the next page. The
following steps explain the typical
refueling procedure with fast fill
equipment. With slow fill equipment,
or other types of refueling
equipment, follow the instructions on
the equipment.
8
Before Driving
Push
Park with the driver’s side of the
1.
vehicle closest to the refueling
station.
Turn the ignition switch to the
2.
LOCK (0) position, and apply the
parking brake.
Open the fuel receptacle lid by
3.
pushing on the handle to the left
of the driver’s seat.
FUEL
RECEPTACLE
RECEPTACLE DUST CAP
Remove the receptacle dust cap
4.
from the fuel receptacle. Clean off
any dirt or debris around the fuel
receptacle.
06/08/10 20:17:05 31SNF910 0010
Securely connect the CNG fill
5.6.
nozzle to the fuel receptacle.
Turn the lever until the arrows on
the nozzle point to each other,
then follow the instructions on the
refueling station to begin refueling.
While ref ueling, you may hear a
chattering sound. This is normal.
Refueling Procedure
If you hear or see fuel/vapor
leaking from the nozzle-receptacle
connection, stop refueling
immediately. Dirt or other debris
may be preventing a positive
connection. Turn off the refueling
station, remove the nozzle,
reconnect it to the receptacle, and
begin refueling again. If it
continues to leak, have an
authorized Honda Civic GX dealer
inspect the sealing O-ring in the
receptacle. It may be missing,
damaged, or worn.
Refueling will stop automatically
7.
when the tank is f ull. Follow the
instructions on the refueling
stationtoturnitoff.
Disconnect the CNG fill nozzle
8.
fromthefuelreceptaclebyslowly
turning the lever on the nozzle 180
degrees. You may hear a brief
hissing sound as a small amount of
gasescapes.Thisisnormal.
CONTINUED
Before Driving
9
06/08/10 20:17:12 31SNF910 0011
Refueling Procedure
If dirt or other debris are adhering to
theinsideofthefuelreceptacle,gas
may leak out after refueling. If this
happens, clean of f the dirt or debris
with a clean, dry rag from the CNG
fill nozzle. If you need to add more
fuel, do the refueling procedure
again.
Putthereceptacledustcaponthe
9.
fuel receptacle securely.
Push the fuel receptacle lid closed
10.
until it latches.
10
Before Driving
If you do not close the lid, the fuel
gauge on the instrument panel will
flash when you turn the ignition
switch to the ON (II) position. The
gauge will stop f lashing when you
close the lid.
If you are not sure how to operate
the refueling station, ask for
assistance.
Ref ueling Station Inf ormation
To obtain information about the
locations of compressed natural gas
(CNG) refueling stations, contact the
Natural Gas Vehicle Coalition
(NGVC) at (202) 824-7360. Online,
use www.afdc.doe.gov for the 49
states, or www.cngvc.org for
California.
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