Need new gas tank + whole system. Advice?

Meanwhile I removed the gas tank. Was quite an easy job.
Only had to cut one of the J bolt because at some point I couldn't lose the screw nut anymore.

Well, what to say. It looks like sh** from the inside.
I think the tank was swapped once, it is not the original. Also the sender unit I think.

Looks like the aftermarket tank and sender unit were not the best quality.
The sender unit rusted up in the down position.

Don't even know what this black stuff is inside.

Here are some pics.

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That black stuff sir looks like someone's cheap way of fixing a tank leak. They poured a sealer of some sort into the tank and swirled it around to seal a leak. Unfortunately it was possibly also responsible for gumming up the sending unit as it should have been taken out first.