My '93 Bandit 400 leaks fuel. The fuel accumulates on the bottom of the float bowl on the right carb when the bike is parked on the center stand. I removed the carbs and it appears that the leak is coming from thr rubber seals on the plastic tee fitting that supplies the fuel to the carbs from the petcock. The seals look like they have taken a compression set with time. Has anyone else experienced this? Also, I have read some of the other carb threads and it seems that everyone that is having issues with carbs recommends replacing some o rings. Which o rings are being replaced? As long as I have the carbs off I might as well do the whole deal. The bike has 13,000 miles on it and it seems to run OK but the exhaust pipe is pretty black (rich running?). Also, the petcock seems to pass a little fuel when the fuel line is removed. Is there a fix for the vacuum valve or should it just be replaced? I am certainly open to any recommendations. Thanks in advance for your help.