If you are passionate about cars, you probably know about constant choke carburetors, constant vacuum carburetors, and multiple venturi carburetors. However, did you know that there is also another type of carburetor that is rarely mentioned? We are talking about electronic carburetors. To be fair, electronic carburetors are not a…
The model BBD is a BB design, dual carburetor with low overall height. Accessible adjustments and removable subassemblies. It has been supplied in both 1 ¼ and 1 ½ inch S.A.E. flange sizes. Five conventional circuits are used. They are: Float circuit Low speed circuit High speed circuit Pump circuit…
AUTOLITE 4100 TROUBLESHOOTING PG2 Black Smoke & Gassy Smell at Idle Check needle & seat for leaking. Use spray carb cleaner and spray through all the small holes in the venturi. Also spray through the corresponding passage that leads down to the idle mixture. Remove idle mixture screw and check…
Engine Cranks but Won’t Start Out of gas Incorrect starting procedure – when cold step on gas once, then crank. Bad fuel pump – Remove fuel line from carburetor, place the open end into a jar or bucket and crank the engine. The correct way to test the fuel pump…
Carburetor Floods Here are some things you can look at, not in any order. When using an electric fuel pump be sure you have a regulator between the pump and the carburetor. Electric fuel pumps put out more pressure than your carburetor can handle. Set the regulator to 4 lbs….
Watch a video about how to replace the main well tube Spark Plugs Burn Black This is an indication that the engine is running too rich. There are multiple reasons for this. Electrical is probably the main culprit so start there. Plugs, wires, distributor, etc. Other possibilities are float level,…
Accelerator Pump Stroke AdjustmentThe accelerator pump stroke has 3 possible adjustments depending on the ambient temperature.The center hole is for normal operations and by default you should use this hole.Hole 1 will decrease the fuel quantity – Use for hot weather.Hole 3 will increase the fuel quantity – Use for…
My AFB has a dashpot. Is it necessary? Yes, it works with the automatic transmission. Not good for the engine to run without the dashpot. Too much unburned fuel when stopping. Gas is dripping from the venturi after shutting down Main discharge may be leaking. Remove the venturi and with…
Why Is My Idle Rough? Idle mixture screws are bent, or scored. Idle mixture is out of adjustment. Idle passage(s) may be plugged. Look here for where the passages are. Vacuum leak – spray carb cleaner around mounting, intake manifold and any vacuum line being used. Mounting may be warped,…
Why Does my Engine Die After Starting? Here is a list of possible solutions not in any order. Number 1 problem would be the ignition. Check plugs, wires and distributor. Clogged fuel filter Weak fuel pump. Test the pressure. Is it dying because of too much gas? Look down the…