If it's fuel injected, then the fuel filter is down below and under the rear passenger side of the car. If it is carbed, then the fuel filter will be a tiny one just off the carb under the hood.
Yes ( it's fuel injected )
fuel filter is on the frame under rear door on passanger side.
on my 96 grand marquis its on the driver side uder the car right below the back door
On a 1993 Mercury Grand Marquis : The electric fuel pump is INSIDE the fuel tank
It is underneath the car, near the left side of the fuel tank.
underside of the car in front of the fuel tank.
Inside the Fuel Tank. You'll have to drain and drop the fuel tank to change it. Not a job for the untrained!
The fuel filter for your 2000 Mercury Grand Marquis is located under the car next to the rear left wheel, just pull off the hoses on each end of the filter and be sure that you have the right hose to the inlet of the new filter put on right.
In the fuel tank
Crawl under the vehicle and follow the fuel line from the fuel tank forward toward the engine. You will find the filter somewhere along that line.
Change the spark plugs, air filter, fuel filter, that's it. Of course, engine oil and filter.
On a 2001 Mercury Grand Marquis : The fuel tank is mounted vertically behind the rear seat