said by cowspotter:I thought the filler nozzles on diesel pumps were bigger than gasoline pumps so this couldn't happen. Do I have that backwards?
Nope, you are 100% correct. Diesel fuel pumps / nozzles are physically larger than gasoline pumps / nozzles and will not fit into the filler neck on a gasoline car.
How the OP managed to do it is beyond me - unless we're being trolled.....