Hmmm well, the only thing I can suggest is maybe jack the car up, and have someone spin it while you look closely from all angles (or visa versa) to find the leak. As from there, it may depend on where the leak is. But it sounds like your doing something like this now, so good luck!
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3
***resident gun idiot***