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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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