Last night and tonight I bent the fuel sender float arms to the right shape and test fit them into the tanks. It’s a bit hard (impossible?) to tell if the floats are exactly where they are supposed to be, since the tanks are already assembled and sealed. Perhaps if I had a tiny borescope I could peek inside the tank drain and see.
These came out ok, and from careful testing, I can tell they are just off the bottom of the tanks (plans call for at least 1/16 from the bottom), and not interfering with the vent lines. I have no way of testing if they are staying clear of the top of the tank.
I can’t do the final install on these until I get another shipment of proseal, hopefully this week.