I have a 1998 E320. The short hose that goes from the PS Reservoir to the Pump is leaking. I have searched throughout the forum, but have not been able to find out whether I need to pull the pump to change it.

Thanks in Advance..

If yours is like the E420, then you don't have to mess with the pump at all. Just take the reservoir off and there is an aluminum nipple that screws into the base of the reservoir. The nipple slides into the short hose from above. There is special hose that Mercedes sells by the meter and it is kind of expensive. You may be able to get the dealer to cut you three inches of it.

Make sure you don't go too short with the hose between the reservoir and the pump inlet or you may not get the hose clamp to make a good seal. I had to do mine over because of this.

You can order the gasket at the base of the reservoir for a few dollars, but I think you can probably get by with the same gasket if it was original. I would probably apply a thin coat of sealant just in case.

N.B. I would check to make sure your car is the same as the older cars before diving into it. MBDoc would know since he's the one who told me how to fix mine.

In the attached pdf diagram, parts 17 and 20 are the aluminum nipple and washer that go into the hose (47) from the base of the reservoir down toward the pump. I used the handle of a 1/4 ratchet to align the hose with the nipple. Some Vaseline also helps the hose to slide over it.

Attached Thumbnails

   

Attached Files

PSResDiagram.pdf (33.7 KB, 173 views)

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles

Great News and tremendous solution. This will save me a ton of time
and energy trying to figure out what needs to be done and how. Appreciate you taking the time to respond.

Lee