Our pumps have black and green
Black is gas with three choices.
Green is diesel but usually available at the end most pumps
You don’t have E15 if you have black pump lines those three are 87,91,93 octane with 10% at most of ethanol the pump should have a EPA sticker on it showing this fuel.contains 10% or less in ethanol. Every legal E15 properly U88 pump in the whole USA will have a bright four inch by four inch dayglow Orange background with bold black lettering clearly showing E15 and the use only in 2001 or newer vehicles or flex fuel vehicles any station that doesn’t have those labels and a dedicated pump line is looking at $50000+ fines. It is nearly impossible to “accidentally” put E15 in a vehicle th person would have to ignore the big Orange label then the push button with E15 on it and then the blue pump line and blue handle. Diesel is green pump line and handle by law.