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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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