Found the source of the smoke fluid leak inside the plane: The in line filters (ala DuBro, Hayes, etc) had slightly unscrewed during line installation.

Solution: 3/8 inch shrink tubing. Needs to be slightly expanded to fit. You do that with a long nose pliers inserted inside the piece, spreading the handles to stretch the shrink tubing. Place it around the filter before it returns to original size. Then heat shrink it.

When you need to clean the filter, remove the tubing.

I do this on filters in the fuel line to the engine if they might be hitting metal from vibration.