Instead of a gasket, the seal between the fuel pump assembly and the fuel tank is typically achieved through a rubber seal or O-ring integrated into the fuel pump's housing or the tank itself. There might also be a sealing ring around the access port to the pump if one exists. These are not typically referred to as a "fuel pump gasket".
To replace the seal, you'd need to refer to a repair manual specific to your 2004 Ford Taurus's engine (3.0L V6 or 3.9L V6) to identify the exact components and their proper names for ordering replacements from a parts supplier. Simply searching for "2004 Ford Taurus fuel pump seal" or "2004 Ford Taurus fuel pump O-ring" will likely yield more accurate results than looking for a "gasket."
