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Originally Posted by MBZ OE
I've been hearing a humming sound from the rear of car even when everything is shut off. I found it to be pressure in my gas tank. When I removed the cap, it stopped.
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I have this problem with my car too. Not sure what the cause is. The noise is intermittant, but it sometimes comes with acceleration, and sometimes comes after the car has been shut off for a couple of seconds. And it does go away once pressure is released from the filler cap.