17.5
( 16.5 gallons ) according to the Owner Guide
The gas tank on the 2009 Ford Mustang holds 16.0 gal..
The gas tank on the 2009 Ford Flex holds 18.6 gal..
The gas tank on the 2009 Ford Fusion holds 17.5 gal..
The gas tank on the 2009 Ford Escape holds 16.5 gal..
The gas tank on the 2009 Ford Expedition holds 28.0 gal..
The gas tank on the 2009 Ford Taurus holds 20.0 gal..
The gas tank on the 2009 Ford Explorer holds 22.5 gal..
The gas tank on the 2009 Ford Focus holds 13.5 gal..
The gas tank on the 2009 Ford Edge holds 19.0 gal..
A 2009 ford fusion holds 14 gallons of gas =========================================================== The above answer would be for IMPERIAL GALLONS According to the 2009 Ford Fusion Owner Guide : Front wheel drive ( 17.5 U.S. gallons ) All wheel drive ( 16.5 )