In some past threads, I read of some problems with gas tanks leaking - I had the same problem. There's a place called Tank Renu that will repair the tank and warranty the work as long as you own the vehicle. I got mine done in '96, and the warranty card shows phone numbers for CA, IA, IL, IN, MI, MN, NJ, NY, OH, PA, TX, WI, and WV. I'm sure they have added more since then.
Check them out on the web at
http://www.gastankrenu.com