IRL less than 2% of auto fires involve fuel lines/tanks etc. Your scenario tends to play out better for intentional fires, tho. So, yeah if you molotov cocktail

IRL less than 2% of auto fires involve fuel lines/tanks etc. Your scenario tends to play out better for intentional fires, tho. So, yeah if you molotov cocktail a car it will ignite...but it does not do so under typical use hardly ever. source: the same one Musk quoted.