Here's why:
* Priming: The primer bulb's purpose is to draw fuel from the carburetor bowl into the engine's intake manifold. This helps to prime the engine for starting, especially when cold.
* How it Works: When you squeeze the primer bulb, it creates a vacuum that pulls fuel into the manifold. When you release the bulb, air rushes back in, which helps to push the fuel into the cylinders.
* Gas vs. Air: If the bulb were filled with gas, it would essentially be overflowing and creating a mess. Additionally, it wouldn't be able to create the necessary vacuum to draw fuel effectively.
Important Note: It's crucial to avoid over-priming your engine. Too much fuel can lead to flooding and make it difficult to start.
If you're unsure about anything related to your engine, it's always best to consult your owner's manual or a qualified mechanic.
