GMC SIERRA 2020 Owner's Manual page 285

284 Driving and Operating
The capless refueling system does
not have a fuel cap. Fully insert and
latch the fill nozzle, begin fueling.
Warning
Overfilling the fuel tank by more
than three clicks of a standard fill
nozzle may cause:
Vehicle performance issues,
including engine stalling and
damage to the fuel system.
Fuel spills.
Under certain conditions,
fuel fires.
Be careful not to spill fuel. Wait
five seconds after you have finished
pumping before removing the fill
nozzle. Clean fuel from painted
surfaces as soon as possible. See
Exterior Care 0 429. Push the fuel
door closed.
Warning
If a fire starts while you are
refueling, do not remove the fill
nozzle. Shut off the flow of fuel by
shutting off the pump or by
notifying the station attendant.
Leave the area immediately.
Filling the Tank with a Portable
Fuel Container
If the vehicle runs out of fuel and
must be filled from a portable fuel
container:
1. Locate the capless funnel
adapter.
2. Insert and latch the funnel into
the capless fuel system.
Warning
Attempting to refuel from a
portable fuel container without
using the funnel adapter may
cause fuel spillage and damage
the capless fuel system. This
could cause a fire. You or others
could be badly burned and the
vehicle could be damaged.
3. Remove and clean the funnel
adapter and return it to the
storage location.