The boiling point of gasoline is around 400 deg F, or 205 deg C. That BP would be for high octane (i assume you're running 93) gasoline. It seems like a hot exhaust could definately achieve such a temperature.
Also, boiling points are pressure dependent (PV = nRT, where P is pressure, V is volume, n is number of moles, R is the gas constant, and T is kelvin temperature). Your tank is pressure sealed to keep vapors from pouring out, primarily for environmental and safety reasons. If your ECU detects a pressure drop (try opening your gas cap with the car idling for a while) it will turn the CEL light on and mess with fuel settings to compensate.
If your tank is pressurized and heated it may not boil, but when you open the tank, the pressure drops and it boils in a frenzy to lower the temperature of the gas. It's kinda intuitive that this is dangerous as all hell, things could catch fire, explode, etc.
Look for threads about tracking your car and exhaust heat. I saw one a while ago about the insulation around the stock exhaust causing things to get insanely hot, and loosening screws. I think someone mentioned something about using ceramic as a heat shield around the pipes or something, but you should look into this. The op posted it as WARNING: blah blah exhaust blah...
Edit:
here it is: http://www.lotustalk.com/forums/f154/warning-track-guys-check-your-exhaust-systems-58233/
Also, boiling points are pressure dependent (PV = nRT, where P is pressure, V is volume, n is number of moles, R is the gas constant, and T is kelvin temperature). Your tank is pressure sealed to keep vapors from pouring out, primarily for environmental and safety reasons. If your ECU detects a pressure drop (try opening your gas cap with the car idling for a while) it will turn the CEL light on and mess with fuel settings to compensate.
If your tank is pressurized and heated it may not boil, but when you open the tank, the pressure drops and it boils in a frenzy to lower the temperature of the gas. It's kinda intuitive that this is dangerous as all hell, things could catch fire, explode, etc.
Look for threads about tracking your car and exhaust heat. I saw one a while ago about the insulation around the stock exhaust causing things to get insanely hot, and loosening screws. I think someone mentioned something about using ceramic as a heat shield around the pipes or something, but you should look into this. The op posted it as WARNING: blah blah exhaust blah...
Edit:
here it is: http://www.lotustalk.com/forums/f154/warning-track-guys-check-your-exhaust-systems-58233/