Fuel systems need special preparations in order to weather the winter unscathed. Even if you do not live in an area that sees brutal winter weather, chances are you will be traveling to colder climates at some point. Changing the fuel filter is the first step. Ensuring that water stays out of the fuel line by using the appropriate additives is a good second step. Making sure that the fuel tank always stays full is an important third step and can help keep the fuel lines from freezing.