on an s13 it's on the left hand side of the driver's seat, you pull to open trunk, and push to open gas tank, but it is possible that a little plastic thing broke, (it happened to me) when you push nothing happens. You basically go open your trunk, and strip the plastic thing on the right hand side (where the gas door is), and you'll find a lil spring to open the gas door manualy, i fixed mine by SHUVING some plastic in there, he'll figure it out how to
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