Here's a link to the subject on CorvetteForum.com
This owner had hairline cracks in the top of his tank!

http://forums.corvetteforum.com/c5-t...k-leaking.html

Here's the only recall I could find for a leaking fuel tank.

1997 CHEVROLET CORVETTE FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY

The following FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY recall/defect on 1997 CHEVROLET CORVETTE vehicles was reported to the National Highway Traffic Safety administration on 1997-06-23. For more information contact the National Highway Traffic Safety administration or the US Department of Transportation. See recall summary below.

Build Years/Makes/Models: 1997 CHEVROLET CORVETTE
UNits affected: 3792
Recall Number: 97V105000
Summary: VEHICLE DESCRIPTION: PASSENGER VEHICLES. THESE VEHICLES HAVE A TORN FUEL TANK SENDING UNIT/PUMP SEAL. THIS CAN CAUSE FUEL ODOR AND/OR LEAKAGE AT THE ATTACHMENT LOCATION.
Consequence: FUEL LEAKAGE FROM A TORN SEAL CAN RESULT IN A FIRE IF AN IGNITION SOURCE IS PRESENT.
Remedy: DEALERS WILL REPLACE THE LEFT AND RIGHT HAND FUEL TANK ASSEMBLIES (INCLUDING FUEL SENDING UNIT AND PUMP).
Notes: OWNER NOTIFICATION:OWNER NOTIFICATION WILL BEGIN DURING JULY 1997. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020.ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-800-424-9393.