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
Gasoline turns into a vapour fairly easily. If you can smell gas, there’s at least some in the air.
So the spark/flame doesn’t have to come out the gas tank. It could come out the tailpipe, the alternator or other electrical things under the hood, etc. Shut it down. Gas burns, but gas vapours are downright explosive.
Modern cars are pretty good and probably safe enough, but if someone or something catches fire at a gas station, people want to blame or sue even if it’s the customer’s fault. Being able to just point at a rule sign and say “you broke the rules” is a great trump card to have.
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