In the common rail diesel engine, direct injection delivers fuel directly to the combustion chamber to produce power and minimize heat loss. Electronic control enables the fuel injection system to be operated with ultimate precision. And high pressure and fine atomization injection significantly increase the fuel efficiency. These three important features produce outstanding engine performance. The high pressure and fine atomization injection injects fuel from the injector into the combustion chamber in extremely fine spray, known as fine atomization. This enables easier ignition and more efficient combustion than previous systems. To achieve this, the diameter of the injection holes at the end of the injector is approximately 0.14 millimeters or about the same as a human hair. Because these injection holes are so small, it is essential that clean fuel be supplied to prevent the fuel from clogging at the point of injection. Form matter is mixed in with the fuel. It will clog the nozzle as you can see here. The full potential of the high performance common rail will not be realized.