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I'm not sure I'd say it's completely harmless, but isn't pumping gas while the car is running generally not a huge risk?
Why would anyone do that outside of a formula one race?
Situations where you can't really turn your engine off. Like I once had my car battery die and after a friend jumpstarted it, I was gonna go drive around for a bit to charge the battery but then I realized my gas tank was completely empty. So I had to fill it up while it was running.
A rare situation for sure, but it's at least one reason.
FYI Formula 1 banned refueling during races in 2010.
Oh that’s news to me. Didn’t follow it for a while.
Even F1 doesn’t take on any fuel during pit stops these days.
Hot exhaust and gas fumes don't seem like a good mix.
I saw my high school chemistry teacher do it and right then, I knew it had to be safe.