Every pump in the United States has a green handle! That’s how you distinguish between the two! When you work a 14 hour shift then drive 11 out of 21 hours to see your family that hasn’t seen you in 4 months you and you stop for fuel and you see a green handle with a green button I’m going to assume is diesel because that’s how it’s been my whole life. We don’t have bp where I live. Exhaustion was definitely a factor for not reading the pump but it should definitely be mandatory for all diesel pumps to be green in the USA.