Several Denver city leaders are looking to clamp down on the planting of new gas stations as a way to prioritize housing and other forms of development — especially near rail transit stops. A proposed zoning amendment released by three City Council members Tuesday would take chunks of the city off the map for future gas pumps by mandating buffers around existing fill-up stations, Regional Transportation District rail stations, and, potentially, low-density residential neighborhoods. The potential zoning code changes would preserve more space for sorely needed new housing and other types of development that better align with the city’s long-term goals, according to a news release.