I have the same set up. (46 H with Tillotson & glass fuel bowl) I can let the fuel turned on for days & it will not leak. I would think the needle & seat is sticking, dirty, or float problem. Float height may need to be set. Theese carbs are as simple as it gets, so it should be an easy fix. I would start with cleaning carb bowl & needle & seat. Good luck & keep Whizzin, Dan

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A.K.A. Likemyspoiler