PSO used to be there, but as the lease ended. It's no longer. It has been replaced since then by Attock, the gas station which is seen in Lahore-Multan Rd. We've never tried it, but as they said in their board that it's company operated pump.
Their more good pumps there like Shell in Liberty, which is company-owned. The best one with nice gauge is PSO at Church Chowk (Girja Chowk).
Just to tell the truth, don't confuse "Gas Stations" with "CNG Stations", It's the american way to refer petrol stations. Over there petrol is called Gasoline.
But avoid Shell in Shami Rd, which is referred as "The Battle Axe", they do the same practice.