GMC 2004 Yukon XL Owner's Manual page 388

The cap will hang on the hook during refueling.
5-10
CAUTION:
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If a fire starts while you are refueling, do not
remove the nozzle. Shut off the flow of fuel by
shutting off the pump or by notifying the
station attendant. Leave the area immediately.
Be careful not to spill fuel. Do not top off or overfill your
tank and wait a few seconds after you have finished
pumping before you remove the nozzle. Clean any
spilled fuel from painted surfaces as soon as possible.
See Cleaning the Outside of Your Vehicle on
page 5-108.