To get 87 octane gas to boil. You need temps that are approaching 200 degrees. Those are temps that you can't touch. I've had an electric fuel pump near my tanks fail on a day when the temp was near 100. The tank, pump, and frame were no were near that. Maybe 125 at most. That day I was pulling my enclosed trailer. GVW was at about 21,000 lbs. Anyone in the Southwest. Check the temps on days like that. Gas just can't boil back there. Even on a hot day.