Filling The Tank - GMC 2016 Silverado Manual

The vehicle always starts on
gasoline. If the fuel selector switch
is in CNG mode when the vehicle is
started, the vehicle will start on
gasoline and switch to CNG when
conditions for CNG operation have
been met. While waiting to
transition, the fuel operation
indicator light will be flashing at a
rate of once per second. If the
vehicle is turned off in gasoline
mode, when started it will remain in
gasoline mode until the fuel selector
switch is pressed. At temperatures
below freezing, it may take 10 to
15 minutes for the vehicle to switch
from gasoline to CNG. If the switch
is pressed to go to gasoline from
CNG while driving, the engine will
change to gasoline operation.
If operating in CNG mode and the
CNG tank is emptied, the vehicle
will automatically switch to gasoline
operation and the indicator light will
flash continuously. Press
the indicator light flashing. If the
system transitions more than
20 times in a single key cycle, it will
remain in the last mode selected.
When the vehicle is heavily loaded,
such as when towing a trailer up a
grade, it may be prevented from
switching to CNG. Once the high
loads are no longer present, the
system will switch.
Fuel Operation Indicator Light
The fuel operation indicator light
shows the current fuel mode or
indicates a transition between fuels.
Off: Vehicle is currently
operating on gasoline.
On: Vehicle is currently
operating on CNG.
Flashing Slowly (Once per
Second): Vehicle is awaiting
changeover to selected fuel or
has started the changeover.
Flashing Rapidly (10 Times per
Second): CNG system error. See
your dealer.
z
to stop
Driving and Operating

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.
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.
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