I have a leak somewhere on my power steering unit on my Ford Fairlane V8 272, I have had the seals replaced in the jack and pressure tested and supposedly it's fixed but I still have a leak and I have already paid out pretty good money to find the leak to no avail, is there some kind of dye that can be added to pump fluid that would show exactly where the leak is ? , i'm still suspecting the seal on the pump..