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Discussion Starter · #1 ·
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!
 

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Have you checked to see if the floats are leaking? If they fill with fuel, or even get some fuel inside they will not work right.
Try removing the float, to see if it is abnormally heavy and shake it to try to detect gas inside. Final test it to float them in a pool of varsol or diesel fuel to see how well they float. Also check for dents or any damage to the floats.
 

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Discussion Starter · #3 ·
Have you checked to see if the floats are leaking? If they fill with fuel, or even get some fuel inside they will not work right.
Try removing the float, to see if it is abnormally heavy and shake it to try to detect gas inside. Final test it to float them in a pool of varsol or diesel fuel to see how well they float. Also check for dents or any damage to the floats.
Floats are sealed, no leaks, no cracks, new and float as they should. Thanks
 

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In that case the only thing remaining (other than a crack or defect in the carb) is your float valve. I would set up a bench test with a temporary fuel tank suspended a foot or two above the carb fuel inlet while you test the operation of the float valve. Move the float up by hand to see at what point it shuts off fuel flow. Very light pressure is all you should need. Please use varsol or something less combustible than gasoline when you do this, as you may spill some and we don't want any explosions.
 

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Discussion Starter · #5 ·
In that case the only thing remaining (other than a crack or defect in the carb) is your float valve. I would set up a bench test with a temporary fuel tank suspended a foot or two above the carb fuel inlet while you test the operation of the float valve. Move the float up by hand to see at what point it shuts off fuel flow. Very light pressure is all you should need. Please use varsol or something less combustible than gasoline when you do this, as you may spill some and we don't want any explosions.
Problem is solved. I made the mistake of assuming that the previous owner had the hoses connected correctly and I put the new carb on with the same connections. When I pulled it out to test as recommended above, the fuel never stopped and it was coming into the carb on the wrong side and not thru the needle and seat. The inlet was hooked to the vent and the vent was hooked to the tank. Sorry for taking up your time, but I will still be scratching my head if I had not pulled it off to test as you recommended. Thanks much!!!
 
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