It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. Our technicians recommend having the complete fuel pump module replaced on high mileage vehicles.Google+
Car Problem Reports
GMC Yukon XL Denali Fuel Level Sensor Failure
GMC Yukon XL Denali Problem
Average Mileage: 128,121 mi (65,000 mi - 200,000 mi)
Visitor, 2002 GMC Yukon XL Denali, 78,600 mi
Fuel gauge was reading erratic. You could never tell how much fuel you had left. While removing the sender from the tank I noticed allot of corrosion in the sender's terminal housing. There was also one terminal with corrosion on it due to a failed o-ring which was causing the failure of the sending unit. GM has a kit which modifies the connectors, housing and o-rings which includes a new fuel level sender. Before attempting this repair yourself, make sure to get the fuel level in the tank as low as possible. Also while removing the tank, be extra carefull to remove ALL of the vent lines especially the smallest one which is about 4mm in diameter. It can break off very easily. They are located at the front end of the tank. Remove the rear fill hose and large vent hose in the back of the tank, then disconnect the brackets while supporting the tank, drop the back down and slide the tank backwards to expose room in the front of the tank to remove the small vent hoses.
Visitor, 2003 GMC Yukon XL Denali, 190,000 mi
Fuel level reads then it doesn't. When it does it will read the correct amount then quits, back and forth.
Visitor, 2004 GMC Yukon XL Denali, 132,000 mi
Gas gauge stopped working.
Visitor, 2001 GMC Yukon XL Denali, 200,000 mi
The weather temperature got to 99°F & the gas gauge went from quarter tank to full & kept jumping then stopped at half tank & hasnt been right since. Prior to that i had the fuel pump changed at 190000.
Visitor, 2004 GMC Yukon XL Denali, 65,000 mi
gas gage sticks in place and will not move
Visitor, 2004 GMC Yukon XL Denali, 91,250 mi
fuel gauge is reading way below empty but the computer states the correct fuel level though.