The inertia switch is in case of a crash where the engine remains running. On the eec-iv if the engine stops the ecu kills the pump relay, on some cars there is an external RPM sensing ( tachimetric ) relay that needs a ignition pulse or it cuts the fuel pump.
I am not sure what the IVA manual states.
Your probably not going to over fuel so long as you have a preasure regulator and return.
Remember also that the pump ( certainly injection ones ) draw quite a few amps, and if left running on a stoped engine will drain the battery.
TT
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