I have been reading about my new old car for a couple hours for the past few days. I keep hearing about a stop lever to kill the motor if it runs away or if the vac fails to stop the motor when you turn off the key. Where is that located?

I like the CO2 idea. I think I need to find one to keep handy just in case.

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Veggie powered 01 F350 CCLB SRW "Tiny"
Soon to be veggie powered 82 300SD - "Squirt" Leaks oil like crazy