[duste79]

imported post

As daveman suggested you have a stuck float(s) or dirt in the needle valve, which gives the same problem. The only way I know to fix this is removing and cleaning all the carbs. It would be difficult to isolate the leaky carb but it could be done, but if it's dirt causing the trouble then there would be dirt in all 4, so better safe than sorry. It's alot easier to Best of luck.

 

[duste79]

imported post

If gas is passing through the carbs , there is trouble somewhere in a carb. The petcock is just a safety and a mechanical aid to keep from draining the fuel tanks when working on the fuel/carb system. It takes only a spec of dirt to stick a valve open and cause a world of grief. I suggest leaving the petcock valve open again for a day and see if it happens again. You may very well have fixed it with the overhall but it would be good to know if you got the trouble fixed for sure. JMO