Diesel Fuel Injection

Common Rail Systems

common_rail_02What is Common Rail?

The term “common rail” refers to the fact that all of the fuel injectors are supplied by a common fuel rail which is nothing more than a pressure accumulator where the fuel is stored at high pressure. This accumulator supplies multiple fuel injectors with high pressure fuel. The fuel injectors are typically ECU-controlled.

Modern common rail systems are governed by an engine control unit (ECU) which opens each injector electronically rather than mechanically. Common rail engines require no heating up time and produce lower engine noise and emissions than older systems.

The main suppliers of modern common rail systems:

  • Bosch – Mercedes, BMW, VW, Audi, Ford, Nissan
  • Delphi – Hyundai, Kia, Renault, VW, Ford, Mercedes, Tata, GWM
  • Denso – Toyota, HNO, Fuso, Mitsubishi, Isuzu
  • Siemens VDO

Mckenzie Diesel service all of the above and are warranty agents for Denso and Delphi.