It's a big deal, 'cause it's INSIDE the gas tank. Haffta drop the whole gas tank to get at it.
Is the big silver plate on top of the engine that reads 5.0.
On a 1992 Mercury Grand Marquis : The Mass Air Flow sensor should be between the engine air filter and the big engine air intake tube
My 99 Pontiac Grand AM SE has a tank capacity of about 11 gallons, give or take a few cups!
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 )
Maximum capacity is 17 gallons.