Section 10D of the Motor Fuels Quality Act limits the vapor pressure (evaporative tendencies) of the gasoline sold or dispensed in Lenawee, Livingston, Macomb, Monroe, Oakland, St. Clair, Washtenaw and Wayne counties from June 1st through September 1st each year to not more than 7 pounds per square inch (MCL 290.650d). If your firm dispenses or delivers gasoline in the control area, you should review the requirement prior to June 1st.
Gasoline stations in the eight county Southeast Michigan areas must sell only the summer-formula gasoline and meet other federal requirements. The gasoline must be formulated to be 7 pounds per square inch (psi) of pressure under the Reid Vapor Pressure (RVP) system, which is lower than normal gasoline psi to reduce the likelihood of evaporation that, in turn contributes to ozone build-up. Gasoline that contains 9-10% ethanol by volume is allowed a one (1) psi vapor pressure waiver under Michigan regulation 561 (R285.561.8).
All phases of the gasoline distribution system including refineries, importers, pipelines, terminals and filling stations must meet the 7 pound psi requirements from June 1 through September 15. Wholesale locations with bulk storage must begin the process sooner to allow total inventory turnover at retail gasoline stations on or before June 1.
Additional information may be obtained by calling the Motor Fuels Quality office bat (517) 655-8202. Public Act 44 of 1984, Motor Fuels Quality Act may be referenced at www.legislature.mi.gov
