6 Pcs 640259 Primer Bulb for Tecumseh VLV126 VLV40 VLV50 VLV55 VLV60 VLV65 VLV66 VLX50 VLX55 TVS90 Engine TC-36045A Lawn Mower with Ring

What It Is

This is a set of 6 replacement primer bulbs (OEM-style 640259) designed to fit Tecumseh VLV, VLX, and TVS90 small engines commonly used on walk-behind lawn mowers, snow blowers, and other outdoor power equipment. The primer bulb manually pumps fuel into the carburetor for cold starts.

Fitment & Compatibility

• Check your engine model: Fits Tecumseh VLV126, VLV40, VLV50, VLV55, VLV60, VLV65, VLV66, VLX50, VLX55, and TVS90 engines.
• OEM cross-reference: Replaces Tecumseh part number 640259 and equivalent aftermarket TC-36045A.
• Physical check: Bulb diameter is approximately 0.75 inches; includes a metal retaining ring. Measure your old bulb’s diameter and stem length to confirm fit.
• Brand/application: Works on most mowers with these Tecumseh engines regardless of deck size or brand (e.g., MTD, Craftsman, Troy-Bilt). Not for Briggs & Stratton, Honda, or Kohler engines.

Key Things to Know

• Quality: Basic aftermarket rubber bulbs; may feel slightly stiffer than OEM but function reliably. 6-pack is good value if you have multiple engines or need spares.
• Installation: Easy—remove old bulb, pop in new one, secure with the ring. No tools required. Ensure the carburetor bowl is clean to prevent debris from clogging the new bulb.
• Common gotcha: If the mower still won’t prime, check the fuel line and primer tube for cracks or blockages—the bulb itself is rarely the only issue.
• Durability: Ethanol-blended fuel can degrade the rubber over time; expect 1-3 seasons per bulb depending on storage conditions.

Should You Buy It

If you own one or more Tecumseh VLV/VLX/TVS90 engines and need a cheap, easy fix for a hard-starting mower, this 6-pack is a solid deal. It’s best for DIYers who want spares on hand—just confirm your engine model and bulb size first. For a single mower, one bulb is usually enough, but the price per unit is hard to beat.