I have a hydraulic leak above the cross member. Should I still drive it?

What is your question?

I don't want to burn up the pump. What should I unplug? The guy I got the car from said he replaced an o-ring in a sending unit above the cross member and it stop[ped the leak for about a year. Any idea what part he is talking about? I want to order a new part, not another o-ring, before I jack up the car and remove the cross member.