A gas cap is an important part of a vehicle's gasoline tank. Although small in size and cheap in price, a gas cap provides a number of critical functions in regard to gasoline-tank safety and integrity.
A gas cap prevents gas tank fumes from exiting a vehicle's gas tank. Gasoline vapors are known carcinogens that also contribute to poor air quality. A gas cap keeps these fumes and vapors safely contained within a gas tank.
In order to protect a vehicle's fuel supply from outside contamination, it must be sealed off and contained within a gasoline tank. A gas cap seals off a vehicle's fuel supply and protects it from outside contaminants.
A gas cap helps to keep a vehicle's gasoline supply under pressure, a pressure that helps gasoline to flow more easily out of the gas tank. Pressurized gasoline is picked up by a vehicle's fuel pump much easier than nonpressurized gasoline.
A vehicle's gas tank inlet provides the entry point for incoming gasoline into a vehicle's gas tank. Any damage or upset to this gas tank inlet would compromise a gas tank's ability to be refueled. A gas cap protects this critical gas tank component.
Any outside moisture that enters a gasoline tank increases the chance for gasoline tank rust and erosion, conditions that can seriously damage the integrity of a gasoline tank. A gas cap prevents outside moisture from entering a vehicle's gas tank.
