Tecumseh Carburetor diagram Briggs
The carburetor is a specific part of a gasoline engine that provides the mixture of air and gasoline as the engine burns. The carburetor mixes the gasoline about 15 times its weight in air to let the engine run smoothly. The speed of the engine can be controlled by the driver by increasing and reducing the flow of the fuel mixture. The carburetor has a float chamber that stores a small amount of gasoline that is fed by gravity in a fuel tank. When the chamber is filled to the proper level, a float that rests on the top of the chamber closes a valve. This restricts the flow from the fuel tank. As the engine consumes the gasoline, the float drops to open the valve and allow the gasoline to flow into the chamber again. The air and the gasoline are mixed in a tube that is located in the throat area of the carburetor. This tube narrows to a small size and widens out again to increase the speed of the air that rushes into the carburetor and in turn lowers its pressure. The high pressure that is generated in the float chamber forces the gasoline through the jets into the tube. The air picks up the gasoline and converts it to vapor into the engine. The engine speed is controlled by a throttle plate valve that lets in more or less of the air and gasoline vapor to enter. In order to open the throttle plate valve the driver needs to press onto the accelerator pedal and let it up to close it. There is another valve that is called the choke plate. This choke plate valve looks similar to the throttle valve and it successfully controls the amount of air that is let into the carburetor. When this valve partly closes the input opening of the carburetor more or less gas is allowed to flow into the engine. When the carburetor is choked the spark plugs can easily ignite the gasoline and the air mixture when the engine turns cold. Thus, the above is the theory on how a carburetor works for an engine.