A little help here perhaps. My Series 1, built Oct/1962. I have the tank out and am ready to re-install it. I noticed on the bottom of the tank there was an " impression" of some sort of insulation material in a rough rectangle. I call SNGB on this and they said yes, in addition to the “donut” around the sump, there was an asphalt based application on the bottom of the tank. They suggest sound insulation material. Then they said there was also the same material in two places on the top side of the tank. My tank has no impression for that, but I never saw it in its original condion.
Anyone know of an insulation type material applied on the bottom as well as in two places on the top?
Again, I have sound deadening material that would function fine, but I have no idea where to place it on the top of the tank. Anyone?