How to Replace the Primer Bulb on a McCulloch Chainsaw

A primer bulb is a small, rubber part that helps to draw fuel into the carburetor of a chainsaw. If the primer bulb is damaged or worn, it can lead to starting problems. Replacing the primer bulb is a relatively easy task that can be completed in a few minutes.

Materials You’ll Need

New primer bulb
Phillips head screwdriver
Flathead screwdriver
Fuel

Step-by-Step Instructions

Locate the primer bulb. The primer bulb is typically located on the side of the chainsaw, near the carburetor. It is a small, round bulb with a rubber diaphragm inside.
Remove the old primer bulb. Use a Phillips head screwdriver to remove the screws that hold the primer bulb in place. Once the screws are removed, you can pull the old primer bulb off of the carburetor.
Clean the carburetor. While the primer bulb is removed, take this opportunity to clean the carburetor. Use a carburetor cleaner spray to remove any dirt or debris that may have accumulated.
Install the new primer bulb. Slide the new primer bulb onto the carburetor. Make sure that the rubber diaphragm is facing the correct way. Secure the primer bulb in place with the screws.
Fill the fuel tank. Add fuel to the fuel tank. Make sure that the fuel is mixed with oil according to the manufacturer’s instructions.
Prime the chainsaw. Press the primer bulb 5-10 times until you see fuel flowing through the clear fuel line. This will help to fill the carburetor with fuel.
Start the chainsaw. Pull the starter cord to start the chainsaw. The chainsaw should start and run smoothly.

Troubleshooting

If you are having trouble replacing the primer bulb or starting the chainsaw after replacing the primer bulb, try the following troubleshooting tips:

Check the fuel. Make sure that the fuel is fresh and that it is mixed with oil according to the manufacturer’s instructions.
Check the fuel line. Make sure that the fuel line is clear and free of obstructions.
Check the spark plug. Remove the spark plug and inspect it for damage. If the spark plug is damaged, replace it with a new one.
Check the carburetor. If the carburetor is dirty, it can cause starting problems. Clean the carburetor with a carburetor cleaner spray.

If you have tried all of the troubleshooting tips and the chainsaw is still not running, you may need to take it to a qualified repair technician for further assistance.

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