3Pack Primer Bulb 640259 for Tecumseh Engines - Direct Replacement for 36045A, 36045 | Fits LAV, LEV, LV, VLV, VLX Series (e.g., LEV80, LV148EA, VLV50) & Toro 20001-20008 Mowers

What It Is

This 3-pack of primer bulbs (model 640259) is a direct replacement for the primer system on Tecumseh engines commonly found in Toro walk-behind mowers (models 20001–20008) and other equipment using LAV, LEV, LV, VLV, or VLX series engines. The bulb creates a vacuum to draw fuel into the carburetor before starting.

Fitment & Compatibility

• OEM cross-references: Replaces Tecumseh 640259, 36045A, and 36045.
• Engine series: Fits LAV, LEV, LV, VLV, VLX (e.g., LEV80, LV148EA, VLV50). Confirm your engine model number (stamped on the engine shroud or valve cover).
• Mower models: Direct fit for Toro 20001–20008 series, but also works on other brands using the same Tecumseh engines (check your mower’s engine plate).
• Measurements: Bulb diameter is ~0.75 inches; stem length ~0.5 inches. Measure your old bulb to ensure match—some aftermarket bulbs vary slightly in stem thickness or nipple size.
• Not universal: Will not fit Briggs & Stratton, Honda, or Kohler engines.

Key Things to Know

• Quality: These are aftermarket bulbs. Some users report thinner rubber that may crack sooner than OEM—check for pliability before installing.
• Installation: Push old bulb out from inside the carburetor cover; new one snaps in. No tools required, but ensure the stem fully seats into the retainer clip.
• Common gotcha: If the mower still doesn’t prime after replacement, the fuel line or carburetor check valve may be clogged. The bulb itself is rarely the sole issue.
• Value: 3-pack for $7.99 is cheaper than buying single OEM bulbs. Keep spares for future replacements.

Should You Buy It

If you own a Toro mower with a Tecumseh engine and the primer bulb is cracked, stiff, or leaking, this pack is a cost-effective fix. It’s ideal for DIYers who want a simple, no-special-tools repair and don’t mind aftermarket parts. Skip it if your engine is a different brand or you’re looking for OEM-grade durability—buy a single genuine Tecumseh bulb instead.