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Odd periodic noise w/engine off

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Old 02-14-2003, 03:50 PM
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2010 ML350 GAS 4Matic
Odd periodic noise w/engine off

I was walking past my car in the driveway today and heard a noise coming from the engine compartment. The car had not been running for over an hour but the noise sounded like something electrial.

It would sound a high pitched whine for about 3 seconds, stop for 5 seconds or so and then do it again. I listened to it do that for about 10 times until I got in my car and left.

Anyone know what this noise could be ? It almost sounded like fuel pump but why would that be running so long after the fact ?

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