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I have had the same problem on my C320 and it's simple to fix You will need 2 screw drivers Look at the gas cap and you should have a metal piece on each side of the cap which is on a spring . You need to slightly pry up both sides and rotate the plastic peice underneath it so both line up correctly. This happens if when the cap is turned to many times and the cap actually goes into the close position even though it's not on. If the cap isn't tight you will also get a check engine light signal,this will go away once you fix the cap. Total process should take you under 5 min. to fix.

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Q: How do you fix a gas cap that will not go on after filling the gas tank on a 2002 C320 wagon?
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