2003 GMC Yukon Owner's Manual - Page 366
2003 GMC Yukon Manual
Page 366 highlights
The fuel cap is located behind a hinged door on the driver's side of the vehicle. While refueling, hang the fuel cap by the tether using the hook located on the inside of the filler door. To remove the fuel cap, turn it slowly to the left (counterclockwise). 5-8
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