Procedures for detecting leaks and preventing corrosion and spills are specified in federal regulations. The procedures vary depending on the age, type, and size of the tanks, and the type of piping between the tanks and pumps. In Minnesota's climate, water is the most common contaminant in petroleum storage tanks. Water in tanks requires cleanup actions that range from pumping the water out of the tank, to removing all the product stored in the tank . It is critically important to keep water out of tanks.
Check fill pipe caps.
They must be water tight. Seals and latches must be in excellent condition. Replacing a fill cap is a lot less expensive than replacing a tank full of contaminated product, or paying to repair fuel-related damage to a customer's car. Check vent pipes. They must have special caps to allow ventilation and prevent rain water entry.