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Old 03-05-2016, 07:24 PM
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Graham Graham is offline
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Join Date: Nov 2004
Location: Ontario, Canada
Posts: 4,393
This dealer site shows the valve and a drawing showing where it fits. As Frank said, it is part of the fuel tank vent system.

Mercedes CLOSED FUEL-EVAPORATION-CONTROL SYSTEM

If you have epc, you can use the part search feature in upper menu bar. Enter the part number with no vehicle data and it will tell you which cars the part is used on. It will also open the epc page where it is listed. Then you will know where MB put it! It could be under the emission section.
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Graham
85 300D,72 350SL, 98 E320, Outback 2.5
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