I recently picked up a project 400 Prairie. It had been sitting for a long time so I just purchased a new carb and intake and when installed it continuously pours gas out the Overflow tube. I have adjusted the float multiple times, it does not seem to make any difference at all. Before installing the new carb I had installed a new fuel filter in a new fuel line to make sure everything was clean and no particles were getting to the needle and seat. I have flushed that multiple times just in case to make sure that is not an issue. I followed the manual and all of the level settting process does not make a difference. I have even set the level way past normal just to try and get it to stop . I also put gas in just the bowl while it was off to confirm that the bottom plug was sealing and not leaking so that is not a problem. I also cleaned up the original carburetor and put that back on and it does exactly the same thing. Looking for any assistance or ideas you may have thank you!