How do you replace the oil pump on a 3.8L ford windstar van?

To replace the oil pump on a 3.8L Ford Windstar, first disconnect the battery and drain the engine oil. Remove the oil pan by unbolting it and carefully prying it off, then detach the oil pump from the engine block. Install the new oil pump, ensuring proper alignment and sealing, then reattach the oil pan and refill the engine with oil before reconnecting the battery. Always consult the vehicle’s service manual for specific instructions and torque specifications.