Gas tank caps: They play an important part in your car's fuel system, even setting off a check engine light on the dashboard if they go missing or aren't screwed on correctly after refueling.

Spilling fuel, besides being a waste of money ... Also, be careful not to mishandle the tank cap, as this element ensures a hermetic seal and prevents excessive evaporation of internal gases.

The fuel tank pressure sensor is part of the fuel pump ... such as a loose or faulty gas cap. Fuel vapors are supposed to be contained in the EVAP system, and leaks can allow vapors to escape ...