* Evaporative emissions. A bad gas cap can allow fuel vapors to escape from the fuel tank, which can contribute to smog and air pollution.
* Reduced fuel efficiency. A bad gas cap can cause your car to use more fuel than it should, as the fuel vapors that escape from the tank can reduce the engine's efficiency.
* Check engine light. A bad gas cap can also cause the check engine light to come on. This is because the car's computer detects the fuel vapor leak and sets a diagnostic trouble code (DTC).
* Stalling. In some cases, a bad gas cap can even cause the car to stall. This is because the fuel vapor leak can cause the engine to run lean, which can lead to engine misfires and eventually stalling.
If you think your gas cap may be bad, it's important to have it replaced as soon as possible. This will help to prevent any of the problems listed above from occurring.
