This is one area where the NEC is confusing, to say the least. While they like to pass the buck to "engineering supervision" or the "AHJ," the code has at least three ways treat exactly the same fuel.
Call it 'heating oil' and theres absolutely no need for anything to be classified.
Call it a "motor fuel dispensing facility," and those rules apply.
Call it "jet fuel" and the rules get really tight.
Personally, if it were only a storage tank, without a containment berm, I'd not consider it a classified location at all. Even the pump I'd be satisfied with, if it was designed for diesel.
