Is there a emergency shut off for the fuel on 2007 Pontiac g5 and where is it?

There isn't a readily accessible, easily-operated emergency fuel shut-off switch on a 2007 Pontiac G5 like you might find on some larger vehicles or machinery. In the event of a crash, the fuel system is designed to mitigate fuel leaks through various safety features, including pressure relief valves and fuel line design. The primary way to stop fuel flow in an emergency situation is to disconnect the battery's negative terminal. This will cut power to the fuel pump.