As fuel enters the pump, there are pistons and valves that that make up what is known as pumping chambers where the fuel is pressurized.Ī regulator is placed in the pump to control the amount of fuel that will enter the chamber. The high-pressure circuit consists of fuel that is pressurized by the high pressure pump. For Denso-style pumps, fuel is supplied to the pump, usually from an electric in-line or in-tank pump. Fuel is drawn in from the tank and through the filter to supply the high-pressure pump. Bosch-style pumps have a transfer pump built into the body of the pump housing. The low-pressure circuit consists of the fuel lines from the fuel tank through the fuel filter and to the high pressure pump. The pump is engine-mounted and driven from the front or rear gear train of the engine. Even though the pumps may vary in design, the basic principle is the same. The Common rail system starts with a high-pressure pump, usually manufactured by Bosch, Denso or Delphi. The diesel fuel system can be divided into three basic circuits consisting of supply, pressure and return. Multiple injections per cylinder combustion are possible.Injection pressures created independent of engine speed.Higher injection pressures which produce finer atomization of fuel. ![]() For the most part, common rail is simple in design, but can be quite complex thanks to the related parts and sensors that create the orchestra for the system. While many owners appreciate the quietness and dependability of their diesel engines, many have no clue as to what changes have taken place to the fuel system in order to not only make their diesel perform, but also be emissions-compliant. Common rail injection for mid-size trucks has been around for nearly 15 years.
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