How much "pressure" is normal when releasing the gas cap? I know that mine always makes a pretty big pressure release...but I've never had gas spew out.

Could I have a problem also? Should there be any pressure release of gas?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k