Submitted by logan0921 t3_z4vkza in explainlikeimfive
popeshatt t1_ixtmedm wrote
Reply to comment by logan0921 in ELI5: Why do you have to turn your car off when you fill up your tank? by logan0921
The gas tank isn't normally open. The engine contains the gas inside, but fueling potentially introduces vapor to the space outside the engine where there could be a spark and the explosion wouldn't be controlled.
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