Thanks.

I might be able to pull the pulley off in their shop (they are farmers and have a nice set of tools for fixing farm equipment) but do I need the pulley off in order to remove the pump? I cannot tell from looking at the photos I have been able to find.

And you are correct about the remote tank. This has one.

I tried asking them and they were scared to even venture a guess since they are new to this Mercedes stuff.