OD (outside diameter) fuel nozzle: diesel 3/4 inch, gas 5/8 inch approx. I've seen some motorists fuel diesel into gas because of worn out hole inside the filler neck. Some idiots tried to pump diesel into the gas, spill over the concrete surface even spill over hands, arms or clothes. One time my mechanics look up over the pump island, I followed their heads, I saw a freaky woman wailed about wet her clothes. I don't know what is going on with her. Mechanic told me she caught diesel spill over her clothes while refuel her car.
