+1CFIDave wrote: ↑Wed May 10, 2023 4:34 pmIn effect, Diamond has a "tab" in the fuel filler opening: There's a vertical metal tab into which the wire that secures the fuel cap attaches. We trained the local FBO fuel service guys to "just get the tab wet" when fueling. This prevents overfilling and fuel coming out of the fuel vents on the bottom of the wings, yet still puts 25 gallons into each main fuel tank.
That is what I did with my 40NG. Since I always watch the fueling, I tell the line person to "fill it to the tab", not "top up", but Dave's "just get the tab wet" sounds even better. When I've rented a DA42 or 62, I've done the same thing. I also learned to not talk to the person while they were fueling as the jet-A pump is usually very high volume, for the turbine planes. With Diamond's multiple tanks in each wing, connected by relatively small hoses, it's easy to fuel too quickly and think it's full when it's still flowing into the other chambers, or blow past the tab if they don't pay attention.
Occasionally somebody will still be asleep at the switch and send fuel spilling over the wing.
And of course they always put the cap on backwards. At my home airport, rather than correct them (they seem to have a lot of turnover), I use it as signal that I need to visually check the level in my next pre-flight.