It should be 15.5 gallons
The fuel tank capacity is 18 gallons
In the fuel tank
Inside the fuel tank
According to the 1999 Mercury Cougar Owner Guide : ( 58.5 litres / 15.4 U.S. gallons )
it is under the back seat
According to my Chilton's Auto Repair Manual : A ( 1991 ) Mercury Cougar has a ( 19.0 US. gallon gas tank )
The fuel tank capacity should be 58.5 liters or 15.4 gallons
relays just plug in to the fusebox
It's a dealer only part. I just went through this, and it's about $250/pair for a 2000 Cougar. Good luck!
under the vehicle along the passenger side frame rail
In the fuel tank next to the fuel pump, I checked with O'reilly and they said it was a FOMOCO part only.
18 gallons ( U.S. ) / 68 liters