Hello Andy and all,
Did they change the part number for the new pump and do you know what it is? I took my pump apart in a 92 500SEL but there was not much I could do except make sure the manifold and valves were clean. I did notice that there is a good bit of heat generated when the pump is in action, and that is when the pump was out of the housing. Considering that it is in a plastic case which in turn is inside a foam housing, I wonder if it simply overheats.

Fred