594281 Primer Bulbs Compatible with 300e 450e 500e Series Engines (2 Pack)

What It Is

This is a replacement primer bulb (2-pack) for small engines, designed to push fuel into the carburetor for easier starting. It fits Tecumseh 300e, 450e, and 500e series engines, commonly found on walk-behind mowers, snow blowers, and small tractors.

Fitment & Compatibility

• Engines: Tecumseh 300e, 450e, 500e series only (e.g., LEV120, LEV160, OHV models). Not for other brands like Briggs & Stratton or Honda.
• OEM Equivalent: Replaces Tecumseh part 594281, 631021, and 632180. Aftermarket, not OEM—check bulb shape and nipple orientation match your carburetor.
• Measurements: Bulb diameter ~1 inch, nipple opening ~0.2 inches. Verify your old bulb’s size; if it’s larger or smaller, this won’t seal.
• Check Before Buying: Remove your old bulb and confirm it has two nipples (inlet/outlet) and the same mounting style (push-in or screw-in). This is a push-in type with a barbed nipple.

Key Things to Know

• Quality: Good for the price, but aftermarket rubber may harden faster than OEM (expect 1-2 seasons in harsh sun or cold).
• Installation: Easy—pull old bulb out, push new one in. No tools needed. If it’s stuck, use pliers gently to avoid tearing.
• Gotcha: The bulb can be brittle when cold. Warm it slightly (hands or warm water) before installing to prevent cracking.
• 2-Pack Value: You get two bulbs for the price of one OEM. Keep the spare for the next season.

Should You Buy It

Yes, if you own a Tecumseh 300e, 450e, or 500e engine and need a quick, cheap fix for hard starting. It’s a solid value for DIYers, but skip it if you want OEM longevity or have a different engine brand.