Rajan Wilcox
If you're looking to remove the carburettor from your Briggs & Stratton engine, there are a few steps you'll need to take. First, you'll want to disconnect the fuel line from the carburettor and the vent line, if your engine has one. Next, you'll need to remove the air filter case and expose the carburettor. You can then remove the nuts holding the carburettor to the engine, and finally, you can gently pry the carburettor tank open and remove it. It's important to note that you should never attempt to repair a damaged fuel tank, as this can lead to fuel contamination, leakage, or fire. Instead, replace the tank with the original manufacturer's equipment.
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What You'll Learn
Identify the problem
Fuel tank maintenance is required when you spot debris in the gas tank or leaking gasoline. If the carburetor is damaged, it may need to be rebuilt or repaired.
Firstly, identify the carburetor by consulting the engine's model information. Then, refer to the engine and equipment manual(s) before starting any work on the carburetor.
Next, remove the carburetor by pushing the hinge pin out of the carburetor body with a small pin or pin punch. Take care to tap only the pin to avoid damaging the carburetor body. Remove the float assembly, inlet needle valve, and fuel bowl gasket. If your carburetor contains an idle mixture screw, remove it along with the spring. Rotate the throttle plate to the closed position and remove the throttle plate screws and the throttle plate.
After removing the carburetor, inspect it for any damage or obstructions. Soak metal and plastic carburetor parts in an all-purpose parts cleaner for no more than 15 minutes to remove grit. Alternatively, spray the parts with carburetor cleaner while wearing safety glasses. Wipe away any solvent or residue with a clean cloth. Do not use wire or tools, as they can damage or further obstruct the openings.
Finally, replace any damaged or clogged parts. Brass mixture screws control the air-fuel mixture at high speed and idle. Over-tightening can damage the tip of the screw, preventing proper adjustment. Remove any non-metal parts and soak the mixture screws in carburetor cleaner for 15 minutes. Inspect them carefully for wear and replace if the tip is bent or contains a ridge.
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Disconnect the fuel line
To disconnect the fuel line, start by removing the spark plug wire and securing it away from the plug. Then, disconnect the battery (if equipped) by first removing the negative lead and then the positive. Next, locate the fuel line clamp or another smooth-faced clamp that is sealing the fuel line to the carburetor. Use this clamp to seal the fuel line where it attaches to the carburetor.
Once the fuel line is clamped, you can proceed to disconnect the line from the carburetor. Hold the line over a bucket or fuel can to catch any fuel that may spill. If your engine is equipped with a vent line, disconnect this as well. After disconnecting the fuel line, release the clamp and safely dispose of the fuel. It is important to note that fuel can be dangerous, so ensure you are working in a well-ventilated area and take the necessary precautions when handling fuel.
Now that the fuel line is disconnected, you can inspect it for any signs of damage or degradation. Over time, the inside of the fuel line can disintegrate, and small pieces of rubber can plug up the carburetor. Additionally, dirt and water from a dirty fuel tank can also find their way into the carburetor, causing issues. If you notice any cracks or dry spots on the fuel line, it is important to replace it rather than attempting to repair it. Fuel lines are not designed to be repaired, and a cracked fuel line poses a risk of leakage, fire, or fuel contamination.
To reassemble the fuel line, follow the disassembly steps in reverse. Ensure that all connections are secure and sealed before restarting the engine. It is important to note that correct reassembly is critical, and if you are uncomfortable with any part of the process, it is best to consult a professional or a repair manual specific to your engine model.
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Remove the carburetor tank
To remove the carburetor tank, you must first ensure the engine is off and the spark plug wire is disconnected. Next, remove the air filter case by unscrewing the 40mm screw that holds it in place with a Flathead #4 screwdriver. Then, use a socket wrench with a 5/16" hex bit to remove the three 20mm bolts behind the air filter. Now, you can remove the plastic backing to the air filter with your hands, exposing the carburetor.
Use a socket wrench with a 1/2" hex bit to remove the 11mm screw at the bottom of the tank. Once the bolt is removed, gently pry open the tank with a metal prying spudger or a flathead screwdriver until it comes off. You can now completely remove the tank for cleaning or replacement.
Before reassembling, inspect the O-ring inside the carburetor tank. If it is dry and worn out, you may need to replace it. Additionally, if your lawnmower is old, consider purchasing a new O-ring as the existing one may be worn.
It is important to note that dirt and water from a dirty fuel tank can plug up the carburetor. Therefore, it is crucial to keep the fuel tank clean and free from debris. If you notice any debris or leaks, inspect the fuel filter and replace the tank if necessary.
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Clean or replace the tank
If you spot debris in the gas tank or leaking gasoline, it's time for fuel tank maintenance. Fuel tanks must be constructed of a non-corrosive material or coated with a corrosion-resistant layer to protect against the damaging effects of water, alcohol, and salt. If the tank is corroded or damaged, it should be replaced.
To clean the tank, start by disconnecting the spark plug to prevent accidental starts. Then, drain the fuel using a siphon or a fuel line cleaner to remove any fuel from the tank. This step minimizes spills. Next, gather your materials: a screwdriver set, wrench set, pliers, clean cloths, a wire brush, safety goggles, carburetor cleaner, and compressed air.
Remove the air filter using a screwdriver to detach the air filter cover and the filter. Inspect it for dirt and replace it if necessary. If your fuel filter is located outside the tank, you can replace it at this stage. If it is located inside the tank, you will need to consult your local Briggs dealer on how to service it.
Finally, detach the carburetor by loosening the screws connecting it to the engine using a wrench or screwdriver. Gently pull it away, ensuring you disconnect any fuel lines without causing damage. Clean the carburetor using the appropriate supplies and reassemble it.
If you are replacing the tank, use only parts recommended by the engine manufacturer. These parts will attach securely to your engine in the space provided. Older model fuel tanks are designed to use a vented gas cap to prevent a vacuum or pressure from forming in the fuel system, while more modern fuel tanks will have either a charcoal filter or charcoal venting system.
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Reassemble the parts
Reassembling the parts of a Briggs carburetor requires attention to detail and a methodical approach. Here is a step-by-step guide to help you through the process:
Firstly, it is important to understand the specific model and type of your Briggs carburetor. Different models may have slight variations in their reassembly processes, so having the correct model information will ensure a precise reassembly.
Now, let's begin the reassembly:
- Place the carburetor tank back into position, ensuring it is securely attached to the engine.
- Reinstall the plastic backing to the air filter. This will involve using a socket wrench with a 5/16" hex bit to secure the backing in place.
- Reattach the air filter case. Use a flathead #4 screwdriver to secure the case with the 40mm screw.
- Reconnect the spark plug wire to the spark plug. Ensure it is properly connected and secure.
- Reinstall any springs and metal arms that were previously removed. These parts are crucial for the carburetor's functionality.
- Reattach the fuel line to the carburetor. Ensure that the line is clamped securely to prevent any leaks.
- Inspect the O-ring inside the carburetor tank. If it appears worn or dry, replace it with a new O-ring before proceeding.
- If your carburetor has a plastic washer, ensure it is in place. This washer is important for maintaining a proper seal.
- Securely fasten the fuel tank or install a new one if necessary. Always use manufacturer-recommended parts for replacements.
- Check the fuel filter for any debris or deposits. If it is clogged or damaged, replace it with a new one.
- Reconnect the battery (if equipped) by first connecting the positive lead and then the negative lead. Ensure a secure connection.
- Finally, inspect all reassembled parts to ensure they are correctly positioned and secured.
By following these steps in reverse order, as suggested by iFixit Repair Guide, you can effectively reassemble the parts of your Briggs carburetor. It is important to take your time and refer to the specific model instructions for your carburetor to ensure a successful and safe reassembly.
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Frequently asked questions
If your carburetor is dirty, your engine may only run on choke and die at other throttle settings.
Make sure the engine is off and the spark plug wire is removed.
You will need a flathead screwdriver, a socket wrench with 5/16" and 1/2" hex bits, a prying tool, and a metal spudger.
If your carburetor is still not working, you may need to take it to someone who has an "Ultra-sonic" cleaning machine.
