Like people leave their engines idling while waiting for a pump and that’s not an issue… and if there was a chance of a spark traveling back along the line and ignigting the tank (and thus, the station), then why doesn’t this happen during normal operation?
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It’s not. The reason you have to shut them off on newer cars is because of the ECU detecting an error in the EPA required systems. refueling with the engine running causes a CEL. Older cars do not care if the car is running.
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