Section R. 285.562.8 - Labeling and marking of retail motor fuel storage tanksRule 8. Fill boxes and fill covers for motor fuel storage tanks must be clearly identified as to the content by at least 1 of the following:
(a) Attaching a tag with the motor fuel name to the fill pipe adapter.(b) Screwing a tag with the motor fuel name onto the fill box rim.(c) Fitting a plastic or fiberglass insert with the motor fuel name inside the rim of the fill box.(d) Color coding by painting the cover of the fill box and the surrounding rim or pavement. When utilizing this system the gasoline storage tank containing the highest octane product shall be coded red, the gasoline storage tank with the lowest octane shall be coded white and gasoline with an octane between the highest and lowest coded blue. A chart or code designating the color designations for other motor fuel storage tanks and vapor-recovery connections and manholes shall be posted on premise in clear view and accessible to a delivery tank driver and made available to the department upon request.Mich. Admin. Code R. 285.562.8