I drove several hours on a 100° day, air conditioner blasting. Gas tank was 3/4 full. Went to open cap to top it off, and roughly a gallon of gas spewed out of it all over me and the ground. Started driving again, 2 hours later i stopped and waited in shade for 20 minutes, turned the gas cap again, and it hissed at me like a cat, no gas came out. No engine light, no messages.