Far as I know.. leaking gas tank is really dangerous..
I also need new gas tank too. I don't have leak.. but
inside of gas tank has dividers to make the gas reading
accurate.. Must of been one of the divider is broken...
So right now I have jumping gas gauge..
I replace the gauge.. / check Fuel Sending unit.. and
final result conclued to gas tank..
Any way gas warning light works.. so no big deal for me..

Go to junk yard and find one.. for $20.. w/o
fuel pump and fuel sending unit..