# How to Replace the Primer Button on a Lawnmower
A primer button, also known as a primer bulb, allows you to manually force gas into the carburetor and piston chamber before you start your cold lawnmower engine. This priming is an important part of getting your engine to start without pulling on the starter rope all day. If the plastic bulb cracks, it loses its ability to create the suction needed to force the gas from the gas tank. When this happens, you must replace the primer button.
Things You'll Need
- Phillips screwdriver
Instructions
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1
Locate the screws that secure the primer button retaining plate to the carburetor and then remove them with a Phillips screwdriver. In most cases, you will locate four screws: one in each corner of the retaining plate.
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2
Remove the retaining plate and the button away from the carburetor. Remove the button from the retaining plate and discard it.
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3
Seat the new button through the hole in the retaining plate and seat the ledge of the button against the backside of the plate.
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4
Place the retaining plate against the carburetor and secure it with the four screws using the screwdriver.
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1
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