Where on the vehicle is it located and does it take a special tool to replace it?
In-Line Fuel Filter on 2003 Buick Park Avenue
The fuel filter on your 2003 Buick Park Avenue is located at the left rear, inboard of the subframe. Their may be quick connect and/or threaded fitting on the fuel lines. You may need a special tool depending on the type of quick connect fitting used - GM uses several.