2016 CHEVROLET EXPRESS CARGO VAN fuel pressure

Chevrolet/GMC Express/Savana CNG Compressed Natural Gas Supplement
(GMNA-Localizing-U.S/Canada-9159237) - 2016 - crc - 6/18/15
Instruments and Controls 3
Instruments and
Controls
Warning Lights, Gauges, and
Indicators
Fuel Gauge . . . . . . . . . . . . . . . . . . . . . 3
Malfunction Indicator Lamp(Check Engine Light) . . . . . . . . . . 3
Warning Lights,
Gauges, and
Indicators
Fuel Gauge
When the ignition is on, the fuel
gauge indicates about how much
fuel is left in the vehicle fuel tank.
An arrow on the fuel gauge
indicates the side of the vehicle the
fuel door is on. The fuel gauge has been calibrated
to display full at approximately
24 800 kPa (3,600 psig) and empty
at approximately 2 758 kPa
(400 psig).
When the low fuel warning indicator
flashes, fill the tank as soon as
possible.
Compressed Natural Gas (CNG)
fuel gauge readings are affected by
changes in fuel temperature and
fuel pressure.
See
Filling the Tank 07.
Malfunction Indicator
Lamp (Check Engine
Light)

Chevrolet/GMC Express/Savana CNG Compressed Natural Gas Supplement
(GMNA-Localizing-U.S/Canada-9159237) - 2016 - crc - 6/18/15
6 Driving and Operating
temperatures drop below−16 °C
(4 °F). When starting the vehicle in
cold weather at high altitudes:
. Use the engine heater. See
“Engine Heater” in the owner
manual.
. Turn off all electrical
accessories.
. Do not hold the ignition switch in
START for more than
15 seconds.
Caution
If you add electrical parts or
accessories, you could change
the way the engine operates. Any
resulting damage would not be
covered by the vehicle warranty.
See “Add-On Electrical
Equipment” in the owner manual.
Fuel
This vehicle is designed to operate
on Compressed Natural Gas (CNG).
The general marketplace fuel quality
of Compressed Natural Gas for
motor vehicles in the state of
California should be in compliance
with Title 13 California Code of
Regulations, Section 2292.5. The
remaining regions of North America
do not employ regulated fuel quality
standards for general marketplace
vehicle usage; however, CNG is
available at both private and public
filling stations. We recommend the
use of CNG that meets or exceeds
SAE J1616 specifications for fuel
composition and cleanliness.
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 24 800 kPa/3,600 psig).
Gas should never be smelled and a
hissing sound should not be heard,
unless refueling is being done.
If gas is smelled or a hissing sound
is heard at any other time, 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. Follow the
instructions under
Fuel System Leak
0 10.

Chevrolet/GMC Express/Savana CNG Compressed Natural Gas Supplement
(GMNA-Localizing-U.S/Canada-9159237) - 2016 - crc - 6/18/15
Driving and Operating 7
Filling the Tank
{Warning
CNG is flammable and highly
explosive. You could be killed or
seriously injured if leaking natural
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.
{Warning
When refueling in temperatures
below−20 °C (−4 °F), CNG may
leak from the fuel tank valve
pressure relief port if the fast fill
method is used. You or others
could be injured if leaking CNG is
ignited. Fill the vehicle with the
time fill method or refuel when the
temperature is above −20 °C
(−4 °F).
Before filling the fuel tanks, turn off
the engine.
The fill valve is behind a hinged fuel
door on the driver side.
There is an identifying blue
diamond-shaped CNG label on the
right rear cargo door. Do not remove
this label —it is necessary for
compliance with NFPA-52
regulations and insuring the vehicle.
Driving without this label may violate
the laws or regulations in some
states. Replacement labels can be
ordered from your dealer. Refueling Procedure
There are two methods of refueling:
fast filling or time filling. Fast filling
is normally used in fuel stations for
natural gas vehicles. It takes about
six to eight minutes to fill up the fuel
tanks. Time filling is done with a
vehicle refueling appliance or a
time-fill post provided by the fleet
operator. Refueling time varies,
based on 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. When refueling, use a
fuel fill nozzle that complies with
ANSI/CSA-NGV 1-2006 standards.
Nozzles are designed according to
their maximum fill pressure: P30
(blue handle) for 20 684 kPa
(3,000 psig) and P36 (yellow
handle) for 24 800 kPa (3,600 psig).
A fuel nozzle less than 7.6 cm (3 in)
long may be difficult to disengage
after dispensing CNG.

Chevrolet/GMC Express/Savana CNG Compressed Natural Gas Supplement
(GMNA-Localizing-U.S/Canada-9159237) - 2016 - crc - 6/18/15
8 Driving and Operating
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. 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 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 is 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/GMC Express/Savana CNG Compressed Natural Gas Supplement
(GMNA-Localizing-U.S/Canada-9159237) - 2016 - crc - 6/18/15
10 Driving and Operating
use with CNG are included with the
vehicle. See an authorized GM
dealer for additional O-rings.
{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.
To replace the fill valve O-ring: 1. Carefully remove the O-ring from the groove in the fill valve.
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 valve. Make
sure the O-ring is properly
seated in the groove.
Refueling will stop automatically
when the tank is full. To disconnect
the vehicle from the refueling station, remove the nozzle from the
fill valve. A hissing sound may be
heard as a small amount of natural
gas escapes. This is normal.
If dirt or other debris is adhering to
the inside of the fuel fill valve, gas
may leak out after refueling. If more
fuel is needed, repeat the refueling
procedure.
Put the fill valve dust cap on
securely and close the fuel
filler door.
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.
{Warning
If the pressure relief devices
release CNG while the vehicle is
being operated, the CNG tanks
will be emptied and it will run out
of fuel. If a release of CNG is
detected, move the vehicle to a
(Continued)
Warning (Continued)
safe stopping location. A loud
rushing noise may be heard when
the CNG is released.
If a pressure relief device
releases CNG while the vehicle is
not running, it is possible that not
all tanks will be emptied. Do not
start the vehicle.
Have the vehicle towed to an
authorized GM dealer for service.
In Case of a CNG Leak
If a CNG fuel leak is suspected, see
Fuel System Leak010.
Fuel System Leak
{Warning
Fuel vapors and fuel fires burn
violently and can cause injury or
death.
(Continued)

Chevrolet/GMC Express/Savana CNG Compressed Natural Gas Supplement
(GMNA-Localizing-U.S/Canada-9159237) - 2016 - crc - 6/18/15
Vehicle Care 15
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.
Fuel System Components
{Warning
Tampering with, or improperly
maintaining the high-pressure fuel
system can cause a dangerous
condition in which serious injury(Continued)
Warning (Continued)
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 fuel tanks located in the
cargo area and under the vehicle,
an integrated fuel pressure
regulator, in-tank fuel shutoff valves,
high pressure fuel lines,
electronically controlled multipoint
fuel injectors, and other equipment.
Fuel system components comply
with appropriate safety standards.
These components have been
designed and approved for use in a
CNG vehicle. 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 cargo area tank
shield. Damage to the 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/GMC Express/Savana CNG Compressed Natural Gas Supplement
(GMNA-Localizing-U.S/Canada-9159237) - 2016 - crc - 6/18/15
16 Vehicle Care
The in-tank fuel shutoff valve is
controlled by the ignition switch and
a solenoid on the high pressure
regulator under the vehicle. When
the ignition is in LOCK/OFF or ACC/
ACCESSORY, the solenoid is off
and the valve is closed, shutting off
fuel flow to the engine. When the
ignition is turned to ON/RUN, the
solenoid is on (for three seconds)
and the fuel shutoff valve is open.Manual Shutoff Valve
Locate the manual shutoff valve so
that it can be found quickly if it is
needed.

Chevrolet/GMC Express/Savana CNG Compressed Natural Gas Supplement
(GMNA-Localizing-U.S/Canada-9159237) - 2016 - crc - 6/18/15
18 Vehicle Care
Towing the Vehicle
{Warning
Improperly positioned tow straps,
hooks, or chains can damage the
CNG fuel system and cause a
leak. If leaking gas catches fire, it
could cause injury or death. To
avoid damage, always flatbed on
a car carrier.
See the owner manual for more
information on towing the disabled
vehicle.
Appearance Care
Exterior Care
Finish Damage
{Warning
Heating the vehicle to above 82 °
C (180 °F) may damage the
Compressed Natural Gas (CNG)
tanks and may cause the fuel
pressure relief device to open and
release CNG. If an ignition source
is present, this could create a risk
of fire or explosion.
CNG tank(s) must be drained by
a qualified technician prior to heat
curing a painted body repair.