Fuel Tank

     An automobile fuel tank must safely hold an adequate supply of fuel for prolonged engine operation. With front-engine vehicles，it is mounted in the rear of the car, under the trunk or the rear seat.

    The size of a fuel tank determines，in part, a car's driving range (distance a vehicle can be driven without stopping for fuel)．Fuel tank capacity is the volume of fuel and fuel tank can hold. Average fuel tank capacity is 45-95 liters.

    Fuel tanks are usually made of thin sheet metal or plastic. The main body of a metal tank is made by soldering or welding two formed pieces of sheet metal together. Other parts are added to form the complete fuel tank assembly. A zinc alloy is normally plated to the sheet metal to keep the tank from rusting.