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Rarely a cylinder will fill with fuel from a seriously flooding engine, making it impossible for the engine to crank. Does the engine TRY to crank? Is the starter engaging? If it's truly filling the cylinder with fuel you should be able to pull the sparkplugs and crank the engine. When that happens fuel should come out of the sparkplug holes. Make sure that you have a couple helpers and some fire extinguishers with you just in case since you don't want that much fuel igniting under your hood.

Admittedly, it's an off-the-wall idea, but it actually can happen. If that isn't your problem, go after the individual problems. Replace the "needle and seat" in the carburetor to solve the flooding problem. If the cylinder isn't filling, track down the starter problems.

The fuel can wash away the oil on the cylinder walls and rings. Best to remove the plugs and shoot a little oil into each cylinder, unit you can easily crank over.

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Q: Why is the carburetor flooding and the engine will not crank?
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