All modern
fuel systems are
fed through a pump, so the fuel tank is typically at the rear of
the chassis under the trunk compartment. Some vehicles have a rear
steam engine with the tank in the forward compartment. The
fuel
tank stores the excess fuel awaiting it is needed for operation
of the vehicle. The fuel tank has an inlet cylinder and an outlet
pipe. The
outlet pipe has a fitting for fuel line
association and might be situated in the top or in the side of the
tank. The lower end is about one-half inch above the base of the
tank so that collected sediment will not be flushed out into the
carburetor. The bed of the tank contains a drain
plug so that tank may be weary and cleaned. The gas tank of the
early cars was placed higher than the engine. The idea was that
the gas will flow down to the engine. This arrangement caused a
trouble when the car went uphill -- the gas flowed away from the
engine. Solution: force up the hill backwards.