Common Rail high-pressure pump, 1997

The high-pressure diesel injection system common rail makes cars more powerful and reduces emissions and fuel consumption. In contrast to competing technologies like distributor pumps and unit-injector systems, the consistently high pressure at which the fuel is stored in the common rail for all cylinders enables up to eight injections in a single injection - for quieter performance and for reducing emissions: up to 96 percent compared with a car from 1990. Every second newly registered car in Western Europe was a diesel by 2006. This made a significant contribution to reducing CO₂ emissions from cars