I'll tell you a little known secret ....what I did with mine 3 years ago and it worked great............ a cap full of dot 3 brake fluid in the pump and drive the car a few hundred miles.
If it is a dry brittle seal the brake fluid will soften it up and swell it
NOTE !!!! this is not a recommend procedure but is a trick I learned years ago from a ford mechanic .
It may or may not work for you ,I personally have not lost a drop of power steering fluid in three years.
DO NOT put more than a cap full in if you try this, too much will ruin all of the rubber items in the system .
More is NOT better with this trick .
good luck
