Johannesburg - The South African Petroleum Industry Association (SAPIA) has confirmed that the petroleum industry is experiencing supply constraints in some areas of Gauteng. "The supply situation is being closely monitored by the Logistics Planning Team, which consists of members of the petroleum industry, the Department of Energy and Transnet," said Avhapfani Tshifularo, SAPIA executive director. Some service stations may face sporadic shortages of one or more grades of fuel as oil companies try to reduce the delivery back-log, the body said. "Everything possible is being done to improve the situation and we will continue to keep the public updated."Earlier this week Shell said it expected petrol stations around Gauteng to run dry of certain grades of fuel.The fuel constraints were due to "production issues at a third party inland refinery and more recently the shut down of our Alberton fuel depot," said Shell. The fuel depot was shut down for safety reasons on Friday evening after a fuel leak at the site.Two weeks ago stations in Cape Town and Gauteng also ran out of certain types of petrol and diesel.