Fuel tank electrolosis rust removal

thanks for the responses. The sump has 2 small channels under it, which I assume it to keep fuel from rapidly leaving the sump. I believe I can clean the channels with compressed air before the tank sealer sets??

There is a 1/4" line exiting the tank which I believe goes to the charcoal canister, inside the tank it is connected to an odd thingy. What is it, will tank sealer plug it? I do not have large hands but I cannot reach it.