How to Replace the Primer Bulb on Weed Eater Lawn Mowers

A few pumps of the primer bulb helps get your Weed Eater mower running.

Weed Eater lawn mowers use a Briggs and Stratton engine to provide power to the cutting blades. Starting the engine is made easier thanks to a primer bulb that you can use to manually pump fuel into the carburetor prior to starting. If this bulb is damaged or worn, it leaks fuel, making the engine difficult to start and creating a fire hazard.

Things You'll Need

• Flat screwdriver

Instructions

1. Disconnect the spark plug by pulling the black rubber boot off the end of the spark plug.

2. Remove the screw holding the air filter cover in place, using a flat screwdriver. Remove the air filter from the filter assembly. Lift the filter assembly and gasket off the top of the carburetor.

3. Pry up on the lock tabs on the sides of the primer-bulb retaining collar with a flat screwdriver and pull the collar off the side of the carburetor. Remove the primer bulb.

4. Fit the new primer bulb into the retaining collar and snap the collar back onto the side of the carburetor. Place the gasket and air-filter assembly on top of the carburetor. Place the air filter in the air-filter assembly. Place the air-filter cover on the assembly, insert the screw into the hole and tighten it snugly with a flat screwdriver.

5. Place the black rubber spark plug boot on the spark plug and press it on until it clicks. Press the priming pump three times and start the engine normally.

Tips & Warnings

• Pressing the primer bulb too many times floods the engine, making it harder to start.

• Gasoline causes burns to eyes and skin. Wear gloves and safety glasses while servicing your Weed Eater lawn mower.

References

• Briggs & Stratton: Illustrated Parts List Model Series 10T500
• Briggs & Stratton: Operator's Manual Model 100000