I recently noticed on a problem with my bike on a trip to Texas. When it was hot outside (over 90 deg) and I refilled the gas tank the fuel pump light would not come on immediately. I would wait a bit then turn the key and all was fine. I then stopped filling the tank to the brim and it hasn't happened since. Maybe cold gas and hot weather pressurizing the tank? I thought it was the engine cut-off switch and stopped using it but still happened. I've refilled several times since without overfilling in hot weather without problems (106 in Missouri).