It is easy to mistake pumps. The multi fuel pumps are sometimes jumbled
Back in the summer I put a diesel nozzle into the mog but only 1 litre went in. The hoses were both black for diesel and V-Power., with a green hose for the 95 octane. I ended up getting the diesel for free and the woman on the till said it often happened. I now read the label on the nozzle with more care first.
Why not standardise and have a red (say) hose for diesel with black/ green for the petrol?
Any added visual aid would help.