Quote:
Originally Posted by Dland10
... It does it regardless of the radio being turned on or off, but doesn't do it unless the engine has started, so I think it's the fuel pump. ...
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That would be my first guess. You should be able to pinpoint the source using a paper towel tube or similar - stick your ear to one end and point the open end toward the pump, amp, &c.
If it is the pump, then some sound-deadening material in that area may help.