Fuel not only provides energy for the vehicle, it also acts as a lubricant for the fuel pump motor, which is located in the fuel tank. Without this lubricant, the motor can burn out. The gas you put in your vehicle contains additives that help to maintain your fuel system. Premium fuels contain more additives and octane. The higher the octane level, the slower the burn, which increases power helping the motor run faster and better. Diesel fuel also contains additives but contains a lower concentrate of water and functions similar to an oil. While additives are great for maintenance and prevention, they cannot fix fuel system issues which are best handled by a professional. To help maintain your fuel system, avoid allowing your fuel level to get too low. Fill up your gas tank once it falls to a quarter of a tank. Repeatedly allowing the tank to get low starves the pump, which can eventually cause the pump to burn out.