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.
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.