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On all of my Hondas the fuel pump always runs as long as the key is turned on, the fuel pressure regulator bleeds fuel back to the fuel tank from the fuel rail, keeping the fuel rail at a steady pressure, the injectors are just valves with fancy little nozzles on them and they are controlled by the cranks shaft positions sensor, and the ECU, so all those parts are still working the ECU is just not telling the injectors to open at all, it's really very simple, it's just a single part of the chain that is being opened.
on early civics the carburator is being told by the ECU to close about 5 valves and that cuts off fuel to the engine, again no fancy timing is needed to restart, it just opens the valves (part of why you have those vacuum lines), it also prevents the engine from over heating and becoming damaged puts less stress on everything as it's not trying to produce power while it's slowing down and it's not trying to burn a fuel ratio that is something other then 17:1.
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