3 of them. The needle fails to seal on the seat either from a hair or flake of junk, or from a slight imperfection in the needle or seat. (old worn needles and seats leak from the fact that the seat and needle have a very wide contact ring that allows any slight accidental needle misalignment to upset the seal)
The seat could be leaking where it is screwed into the body.
The float could be touching the bowl binding and not floating. Float drop specification keeps the float from going low enough to touch the carb body/bowl. If it does touch when no fuel is in the carb, it can stick and never float at all.
Always shut off the fuel when shutting off the tractor, just make it a part of the process each time. It is a gotta do on gravity fed systems, they can fill a barn with fuel in 20 minutes. JimN
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Today's Featured Article - The Great Escape - by Dave Hollrah. It all began Monday with a little baling of second crop on the lake shore field, and as I drove out past my sister and her hubby's place, this small calling sound could be heard from the general direction of their manure pile. Out of the yard, over the cows and bale piles, through the dozer piles, poplars, and brush, out onto the ditch grade road, past the noisy 6.2 diesel engine pulling my well traveled Suburban along. Well it sure didn't take me long to figure out what it was because I alrea
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