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If your engine restarts, you didn't leave it off long enough. The engine was still spinning when you turned it back on, so it injected fuel again and fired it back up.
IMO the best way to do a kill switch is with normally closed relays that cut signal to the fuel injectors. Use any ol switch to control as many relays as you need to cut fuel from the injectors. The normally closed relays protect you in case of a failure (of the switch or relay), your injectors are still getting signal and you can drive home and fix it vs being stranded.
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