How do you change the oil pump on a 2002 mercury grand marquis 4.6 liter?

To change the oil pump on a 2002 Mercury Grand Marquis with a 4.6-liter engine, first, ensure the vehicle is safely elevated and supported. Drain the engine oil and remove the oil pan by unbolting it from the engine, which may require removing the exhaust components for clearance. Then, unbolt the oil pump from the engine block, replace it with the new pump, and reassemble by reversing the disassembly steps. Finally, refill the engine with oil and check for leaks before starting the engine.