The function of the fuel system is to store and supply fuel to the cylinder chamberwhere it can be mixed with air，vaporized, and burned to produce energy. The fuel，whichcan be either gasoline or diesel is stored in a fuel tank. A fuel pump draws the fuel fromthe tank through fuel lines and delivers it through a fuel filter to either a carburetor or fuelinjector，then delivered to the cylinder chamber for combustion.
Fuel system must meter a precise amount of fuel into the engine under a wide range ofconstantly changing operating conditions. The fuel system has the important job ofoptimizing engine performance while keeping fuel consumption and emissions to aminimum.