Thread: what is this strange box with a knob on it? 1995 E320 wagon
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Old 02-02-2011, 02:16 AM
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MBeige MBeige is offline
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The MAS relay is supposed to be behind the battery IIRC. If this is under the dash, it might be a similar looking device.

But first thing comes to mind is the MAS relay for me too. This controls the fuel pump, among other things.
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