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Here’s a great video that goes over how to replace a few different styles of primer bulb. Replacing the primer bulb is a relatively easy task.

Clearly you should replace the bulb, but this trick can let you finish mowing for the day. It should fire right up and run better since you’ve effectively closed most of the hole. Now restart it without pressing the primer bulb in. With a small standard screwdriver, try and close the hole in the bulb by pulling the parts of the bulb so that they are flush with one another. If you can get the mower started, you can wait for it to warm up running poorly.

This is because a vacuum leak is created, much like a normal car or truck would have. When the primer bulb has a hole in it, it changes the characteristics of how the engine runs. Even if it fits, and you replace a vented bulb with a non vented (or vice versa) you’ll end up messing with the air/fuel mixture entering the engine since that tiny hole can let in a tiny amount of air.

Make sure when replacing a primer bulb that you look up the exact bulb that your mower requires. Non Vented– Non vented simply means that the small hole in the center of the primer bulb is not there for your model.It would be more accurate to call a hole in a primer bulb that shouldn’t be there a crack. That being said, some primer bulbs do have a hole that is supposed to be there. Vented– If the primer bulb has a hole, it affects the air/fuel mixture going into the engine and can make the mower both difficult to start and run poorly.This hole is completely normal and should not be of any concern. Vented vs Non-Vented Primer Bulb This is a standard vented primer bulb. This vacuum sends fuel into the carburetor, making the engine ready to fire.When released, a vacuum is created as the primer bulb “snaps back”.How Do You Know if a Primer Bulb is Bad? How a Primer Bulb Works