The aux pump is located on the firewall next to the battery. I have found it easier to remove the battery and then you will see the mono valve assembly which also has the aux pump attached to it. Not a lot of room to work on ir in there. When I changed out my pump and monovalve this past winter I also removed part of the 2nd firewall. It was then very easy to get to everything.
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John
1986 300sdl
1985 380se
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