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Autolite 1100, 1 barrel carburetor questions & answers. Below you will find questions we get from our customers and our suggested solution.
Carburetor Shuts Down on Turns
Mike, My autolite 1100 shuts down when making a sharp right turn, as if the gas shuts off and the engine dies. Can you help with a solution.

F1 (1100) carb had a vent push rod that was actuated by the accelerator pump diaphram arm. vent is open at rest or idle & closed when throttle up or driving. Durning its life rebuilders redesigned the carb & eliminated the vent push rod?? I prefer the rod be there myself. The vent opening inside the air horn is on the opposite side from the pump diaphram. On hard turns,to one side, it could slosh fuel from vent tube down the venturi. Recomend he also check float level (1" for rubber float and 1 3/32" for brass float) and maybe lower it a small amount. If he has a rubber (nitrophyl) float maybe replace with a brass float. Nitrophyl float should weight be under 10 grams.
Can the plastic vent rod be left off the 1100

We have done it without any problem.
Autolite 1100
my autolite 1100 leaks down if you let it sit 15 min or so and it blows black smoke when you start the engine after it sits 15 min or so and also it surges at cruse speeds

1100 & 1101 can't leak down through the main body like some carburetors can. Not knowing the condition of the carburetor (recent carb overhaul done correctly or not overhauled recently) ther are several possibilites. Incorrect float seatting or bad float (rubber/nitrophyl float s/be 1" and brass s/be 1 3/32") If it is the old rubber/nitrophyl float I would replace it with a brass float. Float problems would cause the fuel in the resivoir to percolate on hot soak and drip into the intake manifold, because of a high float level caused by a heavy float or incorrect seatting. It can also leak fuel from the pump discharge port for the accelerator pump because of a missing check ball weight or chech ball not seatting well on its seat. Some carbs can percolate because of there enviroment. (closed small engine compartments like vans) Can try a thicker flange gasket which acts as a thermal barrier to the carburetor as the engine heat over heats the carb on hot soak.

Choke wasn't opening. Hot air tube not hot.

The heat is pulled up through a vacuum passage inside the choke housing. The vacuum is supplied from the bottom of the carburetor via the intake, then travels to the choke housing. You should be able to blow air through into the bottom hole and hear it come through to the choke housing.
In this case the hole was plugged up at the bottom with carbon.
Engine Pops & Sputters When Turning Off

This problem is most likely dieseling, which means there is un-burned gas in the intake and it fires from the heat when turning off the engine.
Automatic transmission type of engines might have a dashpot mounted on the carburetor. Make sure this is adjusted correctly. See adjustments.
Running rich - Lots of things could cause this. Look at your spark plugs. If burning black then you are too rich. The same things that cause richness can also cause flooding. See flooding. A gas smell coming from the engine when idling also indicates it's running rich.



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