Gasoline vapor igniting has nothing to do with heat. Gas vapor has a flash point as low as -50 F. And the autoignition temperature of gasoline vapor is even higher than liquid gasoline (around 530 F). At any rate, that’s why you use a cap on your gas can or gas tank. So the vapor can’t be ignited by a random spark, whether it is the middle of winter in Alaska or summer in Arizona.
Gasoline vapor igniting has nothing to do with heat.
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You need to take a break.