The only incident I’ve ever heard of where an idling vehicle caused a petroleum fire/explosion is the Texas City Refinery Explosion. It wasn’t the hot exhaust, or the alternator, or static electricity. The diesel engine oversped due to the high concentration of petroleum vapors from a catastrophic leak and ignited the air when it backfired. Not gonna happen at a gas station.
I wish more people understood what LEL concentration is. It’s free and available and REQUIRED information but people still seem to think the flammability of gasoline is an enigma