I take you checked all your connecting hoses for leakage. As far as I remmember the power steering pump is the lowest point, so any system leak whould appear to come from the pump. I thightend all hose connectors and my problem was gone. There appear to be to different pumps, which because of the two different belt attachment wheels are not interchangeable. I hope this info is correct since I only relay back what is left in my memory from a couple of years back. Best Regards Ralf