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?
In: Other
At least part of the reasons are unrelated to the engine actually running
There are cars with malfunctioning electrical systems that can cause sparks
People who leave the car running tend to go back in the car during fueling. This increases the risk of static discharge when they go back to the pump.
There is a nonzero chance of a running car being improperly secured when the person exits
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