Common Rail is the cutting edge of diesel technology.

A common rail system is built around five basic components:

  • A high pressure pump with pressure regulator and inlet metering valve.
  • A rail which contains a pressurised reserve of fuel.
  • Injectors which inject precise amounts of fuel into the combustion chamber as required.
  • A Diesel Control Unit - the ‘brain’ of the system, which precisely controls injector flow and timing as well as rail pressure while continuously monitoring the operating conditions of the engine.
  • A fifth and very important component of the system is the fuel filter. Due to the high injection pressures and small nozzle hole size the cleanliness of the fuel is of even greater importance. A common rail fuel filter cleans particles down to as little as 2 microns.