In most cases the fuel gauge sending unit in the fuel tank has failed.
25 gallons ========================================================= The 1999 Ford Windstar Owner Guide shows ( 26.0 U.S. gallons ) Helpfull
The 1999 Ford Windstar does not have a separate computer for the fuel system. The vehicle computer contains all of the functions for the fuel system. The vehicle system computer is located behind the kick plate.
On a 1999 Ford Windstar : ( relay # 207 is the fuel pump relay ) In the Power Distribution Box ( which is " live " ) located in the front of your engine compartment , near the battery
its on the fuel rail, it actually takes temperature of the rail not fuel.
Drive it until it runs out
Behind the service panel on the right side of the cargo area
gage is the best (kon )
I believe the descriptor is: Evap Low Pressure (related to fuel tank)
If you have the instrument panel with the tachometer , just above and to the left of the tachometer is a " check gage " light that comes on if the oil pressure is too low , the engine coolant temperature is too high , or your gas gauge is at or near empty
Either : The engine coolant temperature is HIGH The engine oil pressure is LOW Or the fuel gauge is at or near EMPTY
The check gage light ( if equipped ) lights up if the fuel tank is at or near empty , the engine coolant temperature is high , or the oil pressure is low
Not surprisingly, there is no drain plug - so you'll be using something like a siphon hose.There is one other alternative: drive it until it's empty - that what my wife does...