I have a 2004 F-150 (5.4l V8) with 100,000 miles on it. I am having to refill my steering fluid about every 3 to 4 weeks. No problems with the truck and no steering problems everything feels right. But when i check the small tank under the engine sometimes it is below the minimum line. Any suggestions, Thanks

 

You probably have a leak at the lines going into the pump.

 

Check the connection to the power steering fluid cooler. The cooler is located behind the front bumper under the tranny cooler.

 

Also check the hard line that goes into the bottom of the pump. The seal has a tendency to fail.