I think they only fitted the Inertia Cut Off Switch to the Injected Cars as the fuel from the tank is fed at a considerably higher pressure and there being a (perceived) higher risk of fire from that. Like Peter, I don't feel they are warranted on a Carb Car.
I think that's absolutely right Chris.
Inertia switch introduction seems to have coincided with the very high fuel pressures in modern injection systems, especially in common-rail systems where I believe 150 bar pressure can be used.
When I prepared my Rover 214Si for rallying the first thing I did was to disable the inertia switch. Then I did a rally and whilst refuelling in the middle of the night a Peugeot was towed in. I asked what the problem was. The driver said that the engine had just stopped. The bonnet was open so I pressed the reset on the inertia switch, told the driver to try it and it burst into life! All he had done was to go over a big bump on a bumpy road.
Edited by Cooperman, 05 January 2021 - 10:17 PM.