The fuel pump is located inside the fuel tank. To access the pump, you will have to remove the rear seats.
Also, this vehicle does not have a traditional fuel pump relay, the fuel pump is controlled by a module. Located in the trunk.
I have attached fuel pump and module instructions below. Please note that there are few different options for the module and the pump set up for this S60.
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.