I have an E30, things might be a little different. Although i think the pump is the same for the E36. Either way when mine started to go out i heard the bearing inside of the pump. It started to sounds..well like a bearing was going out. It got worse, and one day just went out.
We all get the urge...Saturday early morning...nothing to do till noon...
The aural sensations of 1st gear WOT
**CGM **(Certified Garage Mechanic)