I have a 2007 Toyota 4Runner Limited Edition with the 4.7 L V8 and it's leaking power steering fluid only when it's running there are no potholes or drips underneath the vehicle in the garage I can't figure out where it's leaking from it seems to leak quite rapidly once driving any suggestions?

 

Possibilities include the seals on the pressure hose out of the pump going to the gearbox, the pumps shaft seal, the shaft th pulley is on, or the gearbox. There are seals for the pressure hose available. There are also rebuild kits for the pump and the gearbox, that include shaft seals.

Best thing to do is clean everything on or under the pump, it's pressure hose, and the gearbox. Then you can run the truck, and see where the leak is, and fix it.

Good luck!
Pat☺