[Big-Foot]

Sounds like you have had your hands full with this project Mike.

As far as sealing the floats with something else - I guess it would be a trial and error process, but whatever you chose, it has to be able to put up with being immersed in fuel for months on end..

Octane boosters are bad for anything that isn't metal. Most of them used some form of Acetone or close chemical compound. If you ever need some glue to hold two pieces of plastic together, just use a dab of acetone between the two pieces - Instant weld..