According to my Chilton book , it either has the ( 16 gallon tank ) or the
optional extended range tank which is ( 18.6 gallons )
According to the 1998 Ford Taurus Owner Guide : ( 16.0 U.S. gallons )
( 18.0 gallons ) according to the 2000 Ford Taurus owner Guide
( 18.0 U.S. gallons ) in a 2003 Ford Taurus
8.0 quarts are needed for a 1990 ford taurus.
For a 1998 Ford Taurus : ( the gas tank capacity is 16 U.S. gallons )
According to the 1998 Ford Taurus Owner Guide : ( 16.0 U.S. gallons )
According to the 2003 Ford Taurus Owner Guide : ( 18.0 U.S. gallons )
According to the 2001 Ford Taurus Owner Guide : ( 18.0 U.S. gallons )
According to the 1996 Ford Taurus Owner Guide : ( 16.0 U.S. gallons )
According to the 2000 Ford Taurus Owner Guide : ( 18.0 U.S. gallons )
According to the 1999 Ford Taurus Owner Guide : ( 16.0 U.S. gallons )
16 Gallons