Boiling gas

2016 outlander 850 has 12 hours on it took it for the last ride before it’s 1st oil change went to fill up in the middle of the ride open the gas cap fuel came shooting out 70 degree day out guys got any solutions for this? Or what would be the best complain to the dealer since still under warranty wrap the exhaust pipe looking for all and any input it’s a brand new machine I switched from polaris never had this issue thanks for the help