I have not tested my theory yet by swapping to an angled fill from the vertical one I have that sprays a lot of fuel but I'm pretty sure a vertical fill will not trigger the auto shut off early enough. https://auto.howstuffworks.com/fuel-efficiency/fuel-consumption/gas-pump-full-tank.htm The sensor tube triggers the shut off with a certain amount of pressure from fuel (head / cm of fuel) . If the nozzle is vertical that might be 5cm from top of the fill. If the nozzle is angled at 45deg the auto shut off should trigger when fuel is 7cm from top.. Anybody see any holes in my theory? I've never seen a vertical fill on a road vehicle but sure see lots on boats.