Answer is your first explination:
At given boost level the pump turns on and then pushes the fluid into the intake trackNote: the pump does not immediately turn on to full pressure, it starts at a lower voltage and ramps up the voltage as boost increases. The pump will be at max pressure when you reach your preset max boost setting on the control box. If you have a solenoid installed in the system I'm guessing the nozzles are behind the throttle bodies and under vacuum at lower engine loads. If that is not the case I am not sure why its there. Yes, an accumulator would help the pulsing effect however, it also creates a new problem. An accumulator would put a delay in pressure delivery when the system activates plus when you shift water will continue to squirt into your plenum because there is stored energy in the accumulator. The problem can get pretty bad depending how big the accumulator is.
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