How do you change fuel pump in a 1999 mercury grand marquis?

To change the fuel pump in a 1999 Mercury Grand Marquis, first, relieve the fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls. Disconnect the battery, then lift the rear seat to access the fuel pump access panel. Remove the panel, disconnect the wiring harness and fuel lines from the pump, and replace it with the new pump. Reassemble everything, reconnect the battery, and check for leaks before starting the vehicle.