There is a notorious fuel leak problem with the 1997-1999 models, on both the fuel pump flange seal (bottom of the tank) and the fuel sender seal located on the side of the tank. These are obscured from view by the fairings. For years, I wondered why the silver colored engine cover had a "yellowish" drip stain on it. And now I know: it was a slow gasoline drip from both of those seals.
This resulted in a service bulletin back in the day to convert the fuel tank to a newer version. The newer one secures the fuel pump flange to the tank with a giant 120mm nut, as compared to the original design that secured the flange using 6 bolts. Obviously, the seals are different for each of the two designs. This wasn't a factory recall - the customer had to have the problem in order for the dealer to perform the swap at no cost.
I recently discovered the leak myself (I've owned the bike since new). In the process of trying to replace the seals on my original fuel tank, I discovered that the rubber seals for the fuel pump flange, the fuel sender, and the filler neck are obsolete. I decided to do the retrofit myself. It only cost me $35 to find a newer version of the fuel tank and fuel pump flange. There are several recent postings that discuss the seals, the service bulletin, etc. The diagrams of the parts and assemblies are easy to find online. All other parts carried over with no problems (fuel system parts, frame mounts, etc.)
My dealer might have done the swap for me at no cost had I asked, but it only cost me about $75 to order the parts (including a used tank and fuel pump flange) and do it myself over the weekend.
Current dealer prices (you can do better):
Fuel Tank upgrade $1056.55 16 11 7 686 431
Fuel Pump Flange $381.18 16 14 2 305 978
Fuel pump nut $13.10 16 11 2 347 284
Fuel pump nut gasket $42.48 16 14 2 347 285
Filler tube gasket $11.74 16 11 7 686 297 < - - w/notches
Fuel sender gasket $11.74 16 11 7 686 297 < - - w/notches
A & B hose clamps (need 4)$1.74 64 12 1 378 285
Filter clamps (need 4) $3.14 16 12 1 176 918
Last edited by torpedo51; Oct 1st, 2018 at 12:10 am.