I have the orig. fuel tank in my ser. #168 818S. Was having fuel leakage problem, so dismounted the seats, firewall etc. I swapped out the FFR supplied square O-rings for some 229 N90 Buna round rings and thought all was well until I completely filled the tank. I again have fuel seepage and smell. I am registered for my first track day next week. I don't know if I should cancel, pull out the seats etc. again and do something different or just take a chance on leakage. Is there any hope for this original tank setup, or should I appeal to FFR or Boyd for something better? This orig. tank seems a really poor design with the fill down low and the fuel level sensor also below the top of the tank.