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Ed:
Well then, the answer in the short term is obvious:
For now, I don't think any harm will be done by disconnecting the connector for the pump itself, I assume you know where it is, over on the engine side of the metal firewall along side the battery. Even if power is being supplied to the pump, if the wire is disconnected, the pump can't run, so no drain will occur. This will help definitely isolate the cause. But MB wants that pump to run for good reason, so I don't suggest this as a permanant cure obviously. I need to do some research for you on this, hopefully Friday I can do this.
Gilly
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