“When they refuel, they’re bringing in the newer gas. If [the] price [the gas station paid for that gas] drops, that’s when you’re going to see the price at the pump drop.

How to avoid 'gas pump switching' in New Jersey While it might seem odd to have someone else offer to pull out your pump at a self-serve station, in New Jersey that's routine.

One gas station attendant told us it's the rain. He says the pumps have sensors to detect gas leaks. When too much water gets in, it triggers the sensors even though there is no leak.