Does the truck have vacuum boosted brakes and/or a vacuum two speed axle shift?
How about a manifold gasket leak or possible internal crack in the exhaust pre-heat area?
Are you SURE the gaskets between the body sections are correct and there's no missing or extra holes, or other differences that could cause a idle-circuit leak?
The screw in the lower section is for idle mixture and won't have any effect until the engine is running properly so it will idle down.
Also, I can' tell for sure in the photo, is the stone or stacked brass discs filter present in the sediment bulb?
(We used to have an old KB-5 IN truck and the local FD has an old IH parade truck that both used the B&B carbs and there were a few other old truck around with them so I am no stranger to them.)
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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