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If the new pump doesnt come with a pulley, then you will need a power steering pulley removal tool to press off the pulley from the old pump and press on to the new pump. Otherwise no specialty tools required:
Fig. Location of power steering pressure (PSP) switch
NOTE If installing a new power steering pump, the unions that are supplied fitted to the pump should be removed and retained for future use.
How to replace Ford Focus power steering pump?
Which engine is in yours - 2.0L or 2.3L ? If you arent sure which, just provide the 8th digit of the VIN code