If the power goes out, the gas station pumps won't work.
It is true that gas pumps are electric. However, in my experience with several major power outages due to hurricanes or winter storms, it was always possible to find a gas station somewhere that was in service. Electrical power typically goes out and is restored in patches. Repair priority is given to certain public needs like hospitals and commercial areas where people buy food and fuel. And anything located close to a substation is likely to have minimal downtime. Also, after several major East Cost storms in recent years, there has been more attention on installing generators at gas stations, sometimes with public grant money. But it still depends on the specific disaster scenario, of course.