I am remodeling a 1976 Sovereign into a commercial biz and do not need either the black or gray tanks. They are both extremely difficult to remove so I am wondering if they can just be permanently sealed off? I am going to just go over them with new flooring and would like to proceed without worries.
Sure. If you have no need for them. There will still be exposed venting (unless you remove the vents). I would just go through the hassle of removing the tanks. Long term, the saved weight will work in your favor to increase fuel economy.
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