[quidam65]

There is also the possibility that the state recently inspected the pumps and that they failed inspection, so they can't sell gas until (unless) repairs are made.

Of course if they stop selling gas, don't be surprised if the whole store doesn't eventually close. There was a store near where I live that for the longest time had the cheapest gas in the area. Suddenly they stopped selling gas, and not too long thereafter there was a For Lease sign in the window.