Those of you fueling from cans without filtration of some kind may be sorely disappointed at some point in future. The Mr. Funnel provides some level of filtration.
I have had totally "clean" cans introduce some water and/or sediments that the funnel caught. I have no idea how that stuff got there, but......clean fuel is far too important to cut corners.
And, yes, I have flown away with a gas cap in my pocket, but not in one of these airplanes. I know a couple pilots who left a cap off a 185 with the old style caps, then took off. Ran out of gas ten miles short of the airport, landed on a road.......fortunately. The Monarch flapper would probably have prevented that episode from being an issue by keeping the fuel in the tank. They'd ported ALL the gas out of both tanks through that one fuel port.
Also, I had the flapper hinge pin work out of it, and drop the flapper into the bottom of the tank. I managed to scrounge around in there and find the thing, and get it re-installed. I flew with these things several thousand hours, so a rare happening, but worth a visual check of the pin position during fueling.
FWIW.
MTV