Flooding in a Carter W-O carburetor (or any carburetor) means too much fuel is entering the engine, often overwhelming the air-fuel mixture and causing poor performance or failure to start.
Here’s what happens:
What Is Carburetor Flooding?
Flooding occurs when excess fuel enters the intake manifold or combustion chamber. This rich condition can drown the spark, prevent ignition, or foul the spark plugs.
Common Causes of Flooding in a Carter W-O Carburetor:
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Stuck or misadjusted float
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If the float is too high or stuck, it allows too much fuel into the bowl. A leaky float can sink and not close the fuel valve.
Check the float pin for wear.
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Worn or dirty needle and seat - Most common
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Fuel continues to flow even when the bowl is full. Try blowing through the inlet with the float in such a position that the needle is closed. Remember it only takes 4lbs + to open the needle.
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Faulty or overactive accelerator pump
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Too much fuel squirted during throttle operation.
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Clogged or blocked air bleeds
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Prevents proper air mixing, causing overly rich mixture.
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Choke stuck closed
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Causes constant rich condition during warm engine operation. When cold the choke valve should be closed. When warmed the choke valve should be open. This carburetor type is usually a manual choke.
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Excess fuel pressure
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A fuel pump delivering too much pressure can overpower the needle/seat. New pumps are especially suspect. Test the fuel pump for 4 lbs.
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Signs of Flooding:
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Strong smell of gasoline near the engine
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Fuel dripping from carburetor throat or vent
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Engine cranks but won’t start
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Black smoke from the exhaust
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Wet or fouled spark plugs
