I hate to have to tell you this, but you are totally in the "normal" progression of the installation and diagnostics process. First of all you are dealing with PS system that was designed and first used 70 years ago. (To see just how far they came in a short period of time, look at the return hose to the pump. It is the same size as the pressure hose. Just a few years later, that hose was now the size of the windshield washer hose). More likely it has never been serviced, other than to add additional fluid.
First question, it the ram leaking? If not you are that much further ahead, and the PS Gods like you!
Hence the reason I had to search out the "newer design" of control valve seals, because the original ones, no mater if they are being remade or not, did not serve to help solve the issue. Believe me, I still have sets of the original design seals, sitting a a drawer.
I was lucky enough to be speaking with a local member, that owns a car wash facility. That system uses high pressure seals, (your PS system is running between 700-900 PSI) that are replaced on a regular basis. I took the original seals into them and explained the issue I was having, and they provided me with the seals I am currently using. I won't guarantee the it will seal it up totally and forever, but it will seal it up to allow you to use it. In 8 years, I have only added additional fluid once and that was less than an oz of fluid.
The upside, is the you don't have to remove the system from the car, the control valve can be serviced while it is still installed.
This prior post was generated because I have been just where you are now. Don't get discouraged, as the issue is correctable. Read over this post and let me know if you have any questions:
https://www.fordbarn.com/forum/show...VUhJR59KincpR1CeMmbUBem68_Uq3XQRhwPUGJ1GqEwv0
Since I am retired feel free:
Roy Lange
Conifer, CO
(303) 838-2028 (land line)
royd13483@aol.com