How do you change 1991 fleetwood brougham Cadillac fuel pump?

To change the fuel pump on a 1991 Cadillac Fleetwood Brougham, first disconnect the negative battery cable and relieve fuel system pressure by removing the fuel pump relay. Raise the vehicle and support it securely, then remove the fuel tank to access the pump. Disconnect the fuel lines and electrical connectors from the old pump, replace it with the new one, and reverse the process to reassemble. Finally, reconnect the battery and test the system for leaks before starting the engine.