Mich. Comp. Laws § 125.571

Sec. 21. All oil burners operating by gravity or water pressure, shall be equipped with approved automatic device or devices for the control of the flow of oil in case of failure of the oil to properly ignite. All oil burners of the suction or force feed type shall be equipped with approved anti-siphoning device. Where a pump is used between the storage tank and the auxiliary tank a pressure relief valve shall be installed in the supply line, so arranged as to return any surplus oil to the storage tank. Suction pipes must extend to within not less than 2 inches from the bottom of the tank and must be provided with an accessible control valve inside the building between the tanks and the burner. All pipe connections, except for gravity flow, shall be made from the top of the tank.