Donna, you are doing a great job on your boat.
One thing that I am not clear on. Do your sight tubes have a valve at both the top and bottom? Current standards call for a valve at both the top and bottom of the tube. The idea is that in the event of an engine fire the valves will keep both fuel from the tank from feeding the fire after the sight tubes finally melt or fail.
Not all boats had the upper sight tube installed, mine included. If not, this is something that your surveyor should have flagged as being a recommended change. Anyway, if you don't have an upper valve, take the opportunity to add one while you are changing the sight tube. Adding that valve is one of my winter projects.
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