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If I remember the last time I had one apart correctly, a spring in the pump pushes the plunger to move fluid, and when it hits bottom the solenoid returns it. If it sealed perfectly, when the flow is stopped, it would quit running altogether, but they're made somewhat leaky, so they just slow...

You're exactly correct. It's not so stupid though, because if you restrict the output of that type of pump, it slows way down. I've thought that maybe it was designed that way because the inductance and/or current consumption of the solenoid valve is not as high as that of the pump coil, so...