2012 Toyota Highlander Owners Manual - Page 95
2012 Toyota Highlander Manual
Page 95 highlights
1 -6 . Re fue ling Ope ning t he fue l t a nk c a p The fuel tank of your vehicle has a special structure, which requires a reduction in fuel tank pressure before refueling. After the opener switch has been pressed, it will take several seconds until the vehicle is ready for refueling.