Originally Posted by Hambone

Well, there's little tiny people that live & work inside the gas tank. Their job is to tell the pump when the tank is full. They have a secret language that nobody can hear except for the gas pumps. The same thing works for when your low fuel light comes on. These guys are monitoring the fuel level and when it gets down to a certan level they flip the switch turning the low fuel light on.

Originally Posted by BonzoAPD

You know the little gremlin in your refrigerator that turns off the light when you close the door? Well his cousin lives in your gas tank and he is the one that tells the pump to stop