Question about 2004 Pontiac Grand Prix
You may need to press down and twist the gas cap at the same time..similar to a "child safe" bottle of asprin or medicine. Usually you remove it counterclockwise
Then when you put gas cap back on press down and turn it clockwise to seall the vacuum in the gas tank.
Many newer cars have this gas cap feature
Posted on Mar 31, 2014
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Posted on Jan 02, 2017
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