Submitted by logan0921 t3_z4vkza in explainlikeimfive
Scizmz t1_ixtqoj6 wrote
Reply to comment by aDvious1 in ELI5: Why do you have to turn your car off when you fill up your tank? by logan0921
Electrical systems ground to the frame of the car. If there's a substantial difference in charge between the nozzle and the frame, sparks are possible, though unlikely. Most fueling systems are grounded out to prevent this.
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