As my understanding is, the failure of the gauge is a result of the float in the tank getting a hole in it resulting in it filling full of gas and..well, not floating (grin). Pretty simple, drop the tank, remove the float, fix or replace the float and reinstall.
If you have replaced the fuel pump, float (the entire unit basically) and it still has the same problem, and Upon start-up it goes to past full and the goes down to past empty, it could be an electrical problem between the tank and the gauge. You needs to check your fuses.
The 1991 to 1994 models have a 15 amp fuse in location # 17 for the fuel gauge
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( Fuse # 17 ) is a 15 amp fuse for the fuel gauge on a 1993 Ford Explorer according to my Chilton repair manual
Start by checking the fuse. The 1991 to 1994 Ford Explorers have a 15 amp fuse in location # 17 of the fuse panel for the fuel gauge. (according to my Haynes repair manual)
Could be bad gauge or float stuck in fuel tank
I'm not a mechanic / technician but by any chance are you out of gas The CHECK " GAGE " light on my Ford EXPLORER would come on if the engine coolant temperature is too HIGH , the engine oil pressure is too LOW , or the gas gauge is at or near empty
Inside the gas tank along with the sending unit for your fuel gauge
Inside the gas tank with the sending unit for your fuel gauge
inside the gas tank along with the sending unit for your fuel gauge
I looked at my Chilton repair manual and the engine wiring schematic for a 1994 Ford Explorer shows ( fuse # 17 - 15 amp - for fuel gauge )
The 2006 Ford Explorer is a gas-powered vehicle.