Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-
Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15
Driving and Operating
15
the 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 valve. A hissing sound
may be heard as a small amount of
natural gas escapes. 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 valve
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 valve for a
missing, damaged, dirty, or worn
O-ring. Reconnect the refueling
dispenser to the fill valve and begin
refueling again. If it continues to
leak, replace the fill valve O-ring.
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.
If it continues to leak after you have
replaced the O-ring, have an
authorized dealer inspect the
sealing O-ring in the fill valve.
If there is dirt or other debris on the
inside of the fuel fill valve, gas may
leak out after refueling. If you need
to add more fuel, do the refueling
procedure again.
See an authorized GM dealer for
replacement O-rings.
