What happens is that the tank gets brittle from the heat over time and will crack. On my 96 I fixed the crack with Shoe Goo and fabric. I stuck well and lasted about 4 years until another crack developed, fixed that the same way and tested it for leaks by sucking air though the fill port and the whole thing just shattered I bought an aftermarket one at Autozone for less that $10. There is no pressure in that tank so my advice is just replace it and not worry about an OEM part. Also one you find at a junk yard will likely be brittle also.