This design helps make for better emissions control.
The Insight’s fuel tank is part of a sealed, pressurized system.
This system helps reduce the amount of fuel vapors that can escape into the atmosphere.
Important Note: To prevent a sudden escape of fuel-tank pressure after the fuel-filler release button is pushed, the fuel-filler door will not open until the pressure has been equalized by the system. This will normally take between 2 and 6 seconds, but could take as long as 20 seconds depending upon ambient heat and other conditions. An indicator on the instrument panel tracks the time remaining until the pressure is relieved. When the door opens, the filler cap can be removed and filling can proceed as normal.