Thanks everyone. I removed the glass and sealed the holes with a new piece of aluminum and plenty of sealant. I'll wait a day or two and then pressure test again.
Since the sight glass seems to be such a sore spot with (what seems to be most all -12 customers), could Van's not replace the sight glass with the gage, note it in the whatever paperwork, then let that be the "per plan" thing? Just asking, I don't know what's involved in changing things on the factory level.
Marshall Alexander
Those posting about their sight glass are not necessarily "most" of the builder, only the ones who have a problem. I think most tanks assembled correctly after the initial design was fixed are trouble free.
Personally, I like the sight glass and being able to actually see the fuel in the tank at the preflight.
Tony
My understanding is that the sight glass is a pre-flight device, allowing to cross check the consistency with the electronic fuel level display. In flight, the cross check could come from the estimated consumption vs display: is there a need to twist your neck to cross-cross check? (the case of detecting a fuel leak can be better handled via the nose . ). The issue of checking gas level while refueling is more concerning: I had like to know what the supporters of the sight glass have to say about it?