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The electric water pump you speak of is for the turbocharger. It should always run for about 20-25 seconds when you turn the key off. It will restart if sufficient heat bleeds into the turbocharger from the exhaust piping and then run for another cycle. If the car is hot enough, this can cause the fans to kick in as well. Mine will run and stop several times when the engine is good and hot.
The purpose of the pump is to keep the oil in the turbocharger bearings below a threshold temperature to prevent deterioration of the oil and, hence, premature bearing failure inside of the turbocharger.
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Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
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