FUEL SYSTEM
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• A four-valve head was essential, but in the smaller engines with reduced bore dimensions, finding space for the valves and the central injector was a real challenge. On the ISC this has been accomplished by moving electronic controls to the pump. A conventional line and nozzle gets fuel into the combustion chamber.
Fuel is pressurized by an internal pump and fed to an accumulator—providing a "common-rail" pressure for each cylinder. The fuel is metered through a single electronic three-way valve then delivered to the correct injection line through a rotary distributor, all built into the pump—hence CAPS for Cummins Accumulator Pump System.
Direct benefits claimed for the newly patented fuel system are a reduction in start-up white smoke and improved cold starting, a beefier torque curve and lower noise levels.