Why did you rebuild the carb, was it doing that before? Or is this something new after the rebuild?
If you're lucky, it'll be the gas cap thing as rustyfarmall said. Makes sense.
But if that doesn't work out...
It's odd that it ran 20 minutes, then only 5 between bouts. If it were always just 5 I'd guess the floats were off - but running 20 minutes makes me wonder.
But even so, I think I'd check that the floats are moving freely, and make sure they're adjusted high enough to let the bowl fill properly.
Of course, the best carb rebuild can be undone by one little chunk of rust/paint/dirt that gets through.
The odds of that happening go way up when you take everything apart and put it back together. Even if you're careful - something somewhere can easily get dislodged.
If this was happening before the rebuild you might want to consider the ignition.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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