793382 790221 Carburetor Primer Bulb for fits Briggs & Stratton Lawn Mower and Snowblowers Engines

What It Is

This is an aftermarket replacement primer bulb (part numbers 793382 and 790221) for Briggs & Stratton engines used on lawn mowers and snowblowers. It primes the carburetor by pushing fuel into the bowl, making cold starts easier.

Fitment & Compatibility

Before buying, verify your engine’s model number (stamped on the valve cover or blower housing). This bulb fits many Briggs & Stratton single-cylinder engines (e.g., Series 450, 500, 550, 625, 675, 725) and common snowblower engines (e.g., 8–10 HP). It replaces OEM part 793382 and supersedes 790221. Measure your old bulb’s diameter (typically ~1 inch) and stem length to confirm. It’s aftermarket, not OEM, so fit may vary on older or non-Briggs engines. Check that your carburetor uses a push-in primer bulb (not a screw-in or integrated cap design).

Key Things to Know

• Quality: Most users report it matches OEM fit and feel, but some note thinner rubber that may crack after a season in extreme cold or UV exposure.
• Installation: Simple—pop off the old bulb (may need a small flathead to pry) and press the new one into the carburetor’s primer hole. No tools required.
• Gotcha: If the bulb doesn’t seat fully, the engine may not prime. Ensure the stem goes straight in and the rim snaps flush.
• Gotcha: If your engine still won’t prime, the carburetor’s internal check valve or fuel lines may be clogged—this bulb alone won’t fix that.

Should You Buy It

If your Briggs & Stratton mower or snowblower has a cracked, hard, or missing primer bulb, this is a cheap, easy fix that usually works. It’s not for engines with integrated primer systems or non-Briggs carbs. For light-to-moderate use, it’s a solid value; for heavy commercial or harsh winter use, consider an OEM bulb for longer life.