2 Pcs 36045 36045A 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 two-pack of replacement primer bulbs for Tecumseh engines commonly found on walk-behind lawn mowers, snow blowers, and small power equipment. It fits engines in the VLV, VLX, and TVS90 series, serving as the push-button that pumps fuel into the carburetor for easier cold starts.

Fitment & Compatibility

Before buying, confirm your engine model (e.g., VLV126, VLV40, VLV55, VLX50, TVS90). These bulbs are direct replacements for OEM part numbers 36045, 36045A, and 640259. They include the retaining ring, but measure your existing bulb’s outside diameter (typically ~1 inch) and the mounting hole size to ensure the ring fits snugly. This works on Tecumseh engines only—check your engine’s model number stamped on the shroud or block. Not for Briggs & Stratton, Honda, or Kohler.

Key Things to Know

• Quality: Aftermarket but well-reviewed; the rubber is durable and seals well, though some users note the ring can be slightly thinner than OEM.
• Installation: Easy—pop out the old bulb, remove the retaining ring, push in the new one, and snap the ring back. No tools required.
• Common gotcha: On older engines, the mounting hole may be brittle or the old bulb’s ring may be stuck. Use a small flathead to gently pry the ring free without scratching the primer body.
• Two-pack value: Keep one as a spare; bulbs wear out over time from UV exposure and fuel degradation.

Should You Buy It

If you own a Tecumseh VLV, VLX, or TVS90 engine and the primer bulb is cracked, stiff, or won’t hold a seal, this two-pack is a cheap, easy fix that restores reliable starting. Skip it if your engine is a different brand or if the carburetor itself is clogged—this only solves a bad bulb, not deeper fuel system issues.