Thanks for all who replied. I also agree, now that I have done some digging. The diagnosis was reported to me by the previous owner. I suspect this young girl who owned the Jeep was being taken for a ride by her mechanic, which is why she sold it to me for such a low price. Upon investigating it today, and with the help of a cooperative parts dealer, I also figure it must be the o - ring. That will be my project for the weekend. As I said, I am new to the vehicle, which is why I came here, to hear the voices of experience. I don't know much yet, but as Redge Edger says, it will be an addictive relationship. And yes I have heard that song before.
Previous car - 83 Jaguar (talk about a pipeline to my bank account!)
Thanks again JB