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There isn't one. GM doesn't use enertia switches like Ford does. Instead your oil pressure sending unit dictates when your fuel system gets power. Once the engine reaches a predetermined oil pressure value power is sent to your fuel pump relay, thus activating the fuel pump. Now the pcm/vcm will activate the priming mode of the fuel system when you turn your ignition switch to on and that's a different circuit by itself.
The General is more concerned about health of the engine. So if you roll over in an accident the engine will stay on for a short period of time them shut off. Once there isn't any more oil pressure the fuel system turns off.
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