The CP3 is driven by a gear off the front of the crankshaft, and then uses electronic solenoids to regulate the amount of fuel pressure delivered to the rail. In the past Cummins engines with the VE, P7100, and VP44 pumps they were called "smart" pumps. They controlled the timing and the amount of fuel delivered to each injector. The CP3 pump is a "dumb" pump. It simply pushes out as much fuel as it is told to and at what pressure it's told to. Then the timing and duration of the injectors is controlled by the ECU sending an electrical signal to each injector.
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