According to the 1996 Ford Windstar Owner Guide :
In U.S. gallons :
The GL has a ( 20 or optional 25 tank )
The LX has a ( 25 tank )
According to the 2000 Ford Windstar Owner Guide : ( 98.4 litres / 26.0 U.S. gallons )
98.4 liters ( 26 U.S. gallons )
Some had a standard 20-gallon tank, others (SE and SEL) have the 25 gallon tank.
The ( 1996 ) Ford Contour has a ( 14.5 U.S. gallon / 55.0 litre gas tank )
18.0 gallons or 68.1 liters.
According to the 1996 Ford Thunderbird Owner Guide : ( 18.0 U.S. gallons / 68.1 liters )
According to the 1996 Ford Aerostar Owner Guide : ( 21.0 U.S. gallons / 79 litres )
16 gallons U.S. ( 60.6 liters )
On a 1998 Ford Windstar : GL / 3.0 liter ( 20.0 U.S. gallons ) GL / 3.8 liter ( 20.0 or optional 25.0 U.S. gallons ) LX ( 25.0 U.S. gallons )
It is a big job. If you attempt it, get a manual from AUTOBOOKSONLINE.COM
For a 1996 Ford Ranger : The ( SuperCab ) holds ( 75.7 litres / 20.0 U.S. gallons )
The SuperCab version is ( 20 U.S. gallons )