Not on the older models and sometimes it doesn't work.
I have had to leg it across a pool of fuel to turn the ignition off when a lady had managed to spin out of a corner on black ice and mounted a dry stone dyke sliding along the top of it before coming to rest.
She was just screaming and trying to haul her kid from the back. The sump had been shattered and the engine had siezed and the fuel was still pumping.