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Float chamber (left) of an updraught carburettor, showing the float (4) and valve (5). A float chamber is a device for automatically regulating the supply of a liquid to a system. It is most typically found in the carburettor of an internal combustion engine , where it automatically meters the fuel supply to the engine.
The simplest form of carburetor, and mainly used in older cars, works on just Bernoulli's principle with the pressure difference from the pressure in the float chamber which is fed from ambient air compared to the static pressure at the fuel entry point and thus is using the second method mentioned above. Mainly used in newer cars is a similar ...
It can also occur during hot starting; high temperatures may cause fuel in the carburetor float chamber to evaporate into the inlet manifold, causing the air/fuel mixture to exceed the upper explosive limit. High temperature fuel may also result in a vapor lock, which is unrelated to flooding but has a similar symptom.
Once the carburetor leaves a stable condition, the float is influenced by both gravity and inertia, resulting in inaccurate fuel metering and a reduction in engine performance as the air-fuel ratio changes, becoming either too lean or too rich for maximum engine performance, and in some cases, stopping the engine. [9]
A float carburetor uses the venturi effect to supply fuel into the engine intake; this depends upon a constant level of fuel in the float bowl to maintain the desired fuel/air mixture. The float operates a valve which keeps the fuel level in the carburetor consistent despite varying demands by means of a linked float valve. As the fuel level ...
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The Reece-Fish is a variable choke, [citation needed] side- or downdraft design, with few moving parts to wear or adjust. To change from side-draft to downdraft, the installer simply rotates the float chamber to suit the carburetor orientation.
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