Ok this is a wierd one. I have a power steering leak in my 66 Mustang with a 289.
It is running the stock steering with power assist, and I replaced the hoses and power steering pump about 2 years ago. It has been running along great until just last weekend. Here is my story:
I parked the car in my nice (mostly) level garage last Thursday (New Years Eve) evening, and left it there all weekend. Well on Monday morning when I went to start it to go to work I noticed power steering fluid on the floor coming out from under the car. I cleaned and checked the power sterring hoses, pump, valve body, and ram and noticed nothing that screamed leak. I then checked the fluid level and noticed it was low so I topped it off and brought it back to full. I then drove the car to work & back home, and noticed no more leaking. But it still was a nagging worry that something was wrong. So while at home I started it up again and while running I turned it from lock to lock. Then I noticed that a small amount of power steering fluid was coming out the filler neck on the pump. So I shut down the car and wiped the fluid off the pump. As I was doing so I looked down and noticed that some of it had pooled on a flat piece of steel down by the sub-frames. While I cleaned that up I suddenly noticed more fluid dripping out of the filler neck on the pump; even though the car was turned off, and the wheels were pointed straight ahead of the car. It was not alot of fluid, maybe a drip evey 2-3 seconds, but that adds up fast.
I have no idea what could cause this. There should not be any air bubbles in the system since I have burped it multiple times. And the hoses, and pump are fairly new and it decent condition.
Tonight I am going to try burping it again to see if there is still a bubble in the system. But if that does not take care of it I am stumped. The olny other thing that comes to mind is either the valve body is bad or the power ram is bad.
If you have any ideas please let me know.