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When you turn the key to "off", the spark is cut and the signal to the injectors is cut. The same ECU controls both, and if only the spark were cut the engine would be able to diesel on for a while.
On older Hondas, I believe that the fuel pressure regulator is on the driver's end of the fuel rail, where the fuel return line comes off of the rail. That should hold pressure when the pump is off. I do not know if there is a separate check-valve elsewhere that holds pressure in the other end of the system, or if the pump itself serves as the check-valve. (I know that some older systems which have pumps mounted outside of the tank do that.)
-soD
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