Should be about 70 Liters, ( 16 Imperial gallons ) and that would be 18.5 U.S. gallons.
According to the 2000 Mercury Grand Marquis Owner Guide : ( The gas tank capacity is 19.0 U.S. gallons )
( 20 U.S. gallons )
ONE - located in the Gas Tank
According to my Chilton's Auto Repair manual : A ( 1987 ) Mercury Grand Marquis has a ( 20 U.S. gallon gas tank )
71.9 liters ( 19 U.S. gallons )
According to the 1998 Mercury Grand Marquis Owner Guide : ( 71.9 litres / 19.0 U.S. gallons )
According to the 2007 Mercury Grand Marquis Owner Guide : ( 19.0 U.S. gallons / 71.9 litres )
It is inside the fuel tank and requires removal of the fuel tank if defective. This is best left to a qualified mechanic.
As much as the gas tank will hold... ---------------------------------------------------------------------------------------------- On a 1997 Mercury Grand Marquis , the gas tank capacity is ( 20.0 U.S. gallons )
On a 1993 Mercury Grand Marquis : The electric fuel pump is INSIDE the fuel tank
On a 2001 Mercury Grand Marquis : The fuel tank is mounted vertically behind the rear seat
In the fuel tank