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aDvious1 t1_ixt7t6q wrote

Reply to comment by revenantae in ELI5: Why do you have to turn your car off when you fill up your tank? by logan0921

But you do create a spark with the engine on. Around 1200 sparks/minute while it's idling.

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Scizmz t1_ixtqoj6 wrote

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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