In 2010 the ISX engine was redesigned once again to accommodate improvements in the emissions technology. From 2001-2010 the engine was a dual overhead camshaft design where one cam triggered the injectors and the other the valve train components. The high pressure injection system is cam actuated to create injection pressure. The fuel system of the ISX is quite complicated encompassing the gear pump, pressure regulators, shutoff valve, lift pump and timing meters to deliver pressurized fuel to the injectors. The 2010 the ISX redesign centered around a single overhead camshaft. The innovation of the common rail fuel system eliminated the need to have the pressurized fuel from an injector camshaft. With the common rail fuel system diesel fuel is pressurized from a multiple piston pump where it is then distributed through tubing to a rail system where it is stored under high pressures up to 30,000-35,000 psi. The change in the fuel system allowed for great fuel economy and thus reduced emissions.

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