* Dirty or clogged carburetor: A dirty or clogged carburetor can restrict the airflow to the engine, causing it to run rich and use more fuel. This can cause the carburetor to only use 2 barrels instead of 4.
* Incorrect fuel pressure: If the fuel pressure is too high, it can cause the carburetor to flood and use more fuel. This can also cause the carburetor to only use 2 barrels instead of 4.
* Vacuum leak: A vacuum leak can cause the engine to run lean and use less fuel. This can cause the carburetor to only use 2 barrels instead of 4.
* Incorrect carburetor settings: If the carburetor is not set up properly, it can cause the engine to run rich or lean and use more or less fuel. This can also cause the carburetor to only use 2 barrels instead of 4.
If you are experiencing a problem with your 4 barrel carburetor, it is important to have it diagnosed by a qualified mechanic.
