Tech Answer

What maintenance is required to keep a carburetor functioning correctly?

For consistent performance, a carburetor must be kept clean. Spray the air bleeds with carburetor spray or WD-40 every week. Air bleeds become clogged from dirt and dyes in the fuel. Clogged or dirty air bleeds can cause a stumble or a high-speed miss in an otherwise perfect carburetor. If you use WD-40, you can also spin the engine over with the ignition off and the throttle open. A liberal spray of WD-40 down the venturi will leave a fine mist of protection on the valve seats and cylinders to prevent rust. Finally, carburetors should be rebuilt at least once a year and more frequently if operated in dirty conditions. Applications running alcohol require additional maintenance beyond that of a gasoline fuel system. Alcohol, being extremely corrosive in nature, should not be left in the fuel system or carburetor for an extended period of time. Proper care includes draining and flushing the entire fuel system, usually with gasoline. The most common method is to drain the system and add gasoline to the fuel cell allowing the pump to draw fuel through the lines and to the carburetor. Alcohol carburetors are much richer than gasoline, so when the engine begins to idle and die, the system is pretty well flushed. Lastly, always use a fuel additive that lubricates the fuel system while racing.

Applications running alcohol require additional maintenance beyond that of a gasoline fuel system. Alcohol, being extremely corrosive, should not be left in the fuel system or carburetor for an extended period of time. Proper care includes draining and flushing the entire fuel system, usually with gasoline. The most common method is to drain the system and add gasoline to the fuel cell allowing the pump to draw fuel through the lines and to the carburetor. Alcohol carburetors are much richer than gasoline, so when the engine begins to idle and die, the system is pretty well flushed. Always use a fuel additive that lubricates the fuel system for protection while racing.

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