You’re driving along when suddenly, your vehicle chokes and sputters to a halt, starved of fuel — or you are driving along just fine and suddenly, your exhaust system begins to belch black smoke. When you turn off the engine and look under the hood, you find fuel dripping from the carburetor throat. Both problems may be caused by a stuck carburetor float. Fortunately, you can take steps to get the carburetor working again temporarily, until you can open up the carburetor and fix the float permanently.
Open the hood and locate the carburetor body. Tap the top of the carburetor gently but firmly with a small hammer or screwdriver handle. Tap the bowl of the carburetor firmly. This may loosen a stuck float valve, allowing the float to work properly until you can fix the problem permanently.