If it is not excessive - try a can of Drygas. If it is excessive syphon fuel from tank add Dry gas and refill with new fuel dry gas Try using dry gas what makes you think you have water in your fuel? I've never seen water stopping the vehicle from running no need to siphon fuel out is probably some other problem unless someone put a water hose in your gas tank for a big joke you cannot get enough water to stop the car keep your gas tank half-full all the time if possible.
You must drop the fuel tank to access the pump.
On a 2001 Mercury Grand Marquis : The fuel tank is mounted vertically behind the rear seat
You can buy a siphon kit at your local auto parts.
do you have to remove fuel tank to replace fuel pump
On a 1985 Mercury Grand Marquis, the fuel pump is located inside the fuel tank. To access it, you'll typically need to remove the tank from the vehicle, as it is not externally accessible. It's advisable to disconnect the battery and relieve fuel system pressure before attempting to remove the tank for safety.
According to my Chilton's Auto Repair manual : A 1988 Mercury Grand Marquis has a ( 20 U.S. gallon ) gas tank
The ( 2007 ) Mercury Grand Marquis has a ( 19 U.S. gallon tank )
It's a big deal, 'cause it's INSIDE the gas tank. Haffta drop the whole gas tank to get at it.
According to my Chilton's Auto Repair manual : A ( 1987 ) Mercury Grand Marquis has a ( 20 U.S. gallon gas tank )
Inside the fuel tank.
In the gas tank.
In the Gas Tank