Why do cars go nuclear when I shoot at them?

Why do cars go nuclear when I shoot at them? - Two Men Driving Go Karts In A Circuit

I've been playing a bunch of Fallout 3 lately to prepare for Fallout IV, and one thing I noticed is that when I shoot cars with my Chinese Assault Rifle that was modded in with mega damage, they explode in mushroom clouds and leave behind radiation. Why is this?

fallout-3

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Why do cars go nuclear when I shoot at them? - Man Wearing Black Shirt Looking at Car Engine Bay

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