One problem related to other fuel system tank filling/charging has been reported for the 2015 Mini Cooper S. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Mini Cooper S based on all problems reported for the 2015 Cooper S.
Fuel filling nozzle shuts off repeatedly while refueling. Upon gassing up, valve clicks immediately and pump shuts off like it's full no matter which gas station or pressure I exert. I saw a bulletin "si m16 01 15" which affected Minis produced in 2014 but did not include my 2015 Cooper S. A comment from the bulletin had a temporary solution which is to angle the pump to 45, then pump slowly at the magic speed, though this can take anywhere from 10 to 30 minutes. This is dangerous on my part as I travel past midnight for several hours and spending more time at a gas station in the dark is worrisome. I do get spills occasionally which I have to keep wiping and is a station hazard. Replacing the fuel tank completely at an estimated $2k+ is too costly especially during this pandemic and is due to faulty manufacturing.