The miles-long lines at gas stations in the greater New York area will likely continue for days because even when power returns to fueling stations, there may be very little gas left at the pump, a gas station lobbyist told CNBC Friday.

Customers pump gas.

As vice president of the National Association of Convenience Stores, John Eichberger represents roughly 80 percent of the U.S.'s retail gas stations. Four days after superstorm Sandy savaged the Northeast, many stations remained closed because of a lack of fuel, a lack of power to pump it or both. Speaking on CNBC's "Fast Money Halftime Report," Eichberger said some stations will immediately be able to start pumping gas when the power returns, though.