How do you replace a fuel pump on a 1997 Buick Riviera?

To replace the fuel pump on a 1997 Buick Riviera, first, relieve the fuel system pressure by removing the fuel pump relay and running the engine until it stalls. Next, disconnect the battery and remove the rear seat to access the fuel pump module. Drain the fuel tank, then unbolt and remove the fuel pump module from the tank, replacing the old pump with a new one, and reassemble everything in reverse order. Finally, reconnect the battery and check for leaks before starting the vehicle.