A gas cap that doesn’t fit right is a hazard to the owner and the environment in the following ways:
- It allows fuel to evaporate and escape the gas tank and pollute the environment.
- The efficiency of the fuel can be reduced — sometimes by as much as two percent.
- It can allow dirt, debris and other contaminants to enter the gas tank. These contaminants can degrade the fuel and cause harm to other parts of the vehicle.