[Chrysler300] Gas Tank Pressure!!

["Michael Reed" <mrreed@xxxxxxxxxxxxxx>]

My "F" is experiencing something I find odd (and a bit disturbing), Hoping to find an answer from my fellow 300 owners.

I stopped at a gas station about 5 miles from home yesterday to purchase some gasoline. When I twisted the gas tank cap to remove it, there was enough pressure in the tank to almost blow the cap out of my hand. I put about 6 gallons of gasoline in, and drove home. When I got home I removed the cap again, and again there was already a significant amount of pressure in the tank. This has happened at least one other time this year, and a few times last year - but this doesn't occur every time I remove the cap immediately after driving (short or long distance).

I could understand if there was a vacuum in the tank -- but not pressure! And after only 5 miles!

Any ideas, anyone?

Mike Reed in beautiful Lake Odessa, Michigan

 

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