I"m no expert, but I think you still have a regulator problem. The diaphram controls a needle and seat type of valve to regulate the amount of fuel needed according to the manifold vacum. With the motor not running ( no manifold vacum ) no gas should be passing into the carb. A spring usually holds the valve shut. if there are no holes on the diaphram then the problem could be the seat or maybe the spring. Sounds like a rebuild kit for the regulator might be in order. I have no first hand knowledge of the IH setup but they are all similar.
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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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