How to Rebuild a Leaf Blower Carburetor

 

file

This DIY repair guide shows how to rebuild a leaf blower carburetor. The carburetor mixes fuel and air in the right proportions so that the spark plug can ignite the mixture inside the cylinder, powering the engine. If the leaf blower engine won't start even though there's fuel in the tank, the carburetor could be the problem. Follow these instructions to rebuild a carburetor using a manufacturer-approved replacement part.

Follow these steps to rebuild the carburetor on Craftsman, Poulan, MTD, Husqvarna, Weed Eater and Troybilt leaf blowers.

Another option is to replace the carburetor, following the steps in How to Replace a Leaf Blower Carburetor.

Repair difficulty:
     
Time required:

Less than 60 min.

Parts Required

  • Carburetor rebuild kit

For manuals, repair guides, and specific part recommendations, enter your model number.

Tools Required

  • Torx screwdriver
  • Needle nose pliers
  • Work gloves

Before you begin

Wear work gloves to protect your hands.

Instructions

 Warning: Undertaking repairs to appliances can be hazardous. Use the proper tools and safety equipment noted in the guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs should only be performed by a qualified technician.

Step 1: Drain the fuel tank

In a well-ventilated area, remove the fuel cap and empty the fuel tank into an approved storage container. 

Step 2: Disconnect the spark plug wire

Disconnect the spark plug wire.

Step 3: Remove the air filter cover

Remove the screws from the air filter cover.

Remove the air filter cover.

Step 4: Remove the carburetor

Remove the carburetor mounting screws.

Pull the air box out and release it from the carburetor throttle and choke levers.

Note the configuration of the small and large fuel lines on the carburetor. Remove the fuel lines from the carburetor.

Discard the carburetor.

 

Step 5: Remove the top cover and primer bulb

Remove the top cover with the primer bulb from the carburetor. 

Remove the primer bulb from the top cover.

Remove the gasket and diaphragm from the top cover.

Replace the primer bulb if it’s stiff or damaged.  

 Tip: Line up the components on your work surface so that you can replace the parts in order.

Step 6: Remove the bottom cover and diaphragm

Use a Phillips screwdriver to remove the screws from the bottom cover of the carburetor.

Remove the bottom cover and diaphragm.

Separate the bottom cover and the diaphragm.

Step 7: Remove the screw securing the needle and fuel lever

On the bottom of the carburetor, note how the lever, spring and hinge pin fit together. Remove the screw and pull those components out of the carburetor.

Step 8: Clean the carburetor and let dry

Clean all ports and jets in the body of the carburetor with aerosol carburetor cleaner and compressed air. Allow the carburetor dry for at least 10 minutes—some carburetor cleaners can damage the diaphragms if the carburetor is reassembled when still wet.

Step 9: Reassemble the carburetor

Install the needle and lever on the bottom of the carburetor and screw them into place. Then install the gasket, diaphragm and cover, in that order. 

Install the top cover and primer bulb. 

 Warning: Install the components in the same order and manner in which they were removed.

Step 10: Reinstall the carburetor

Push the fuel lines onto the proper connections on the carburetor.

Insert the carburetor into the air box with the throttle and choke levers positioned properly.

Position the carburetor on the side of the engine and reinstall the mounting screws. 

Step 11: Reinstall the air filter cover

Position the air filter cover over the carburetor and secure it with the mounting screws.

Step 12: Connect the spark plug

Reattach the spark plug wire.