New 594061 Fuel Tank Cap Toro Smart Stow Fuel Cap Compatible with Briggs & Stratton fit 594061

What It Is

This is a replacement fuel tank cap for Toro Smart Stow lawn mowers, designed to fit engines equipped with a Briggs & Stratton 594061 cap interface. It seals the fuel tank to prevent leaks, fuel evaporation, and debris ingress, while also allowing proper venting during operation.

Fitment & Compatibility

Before buying, verify your mower’s model number (not just brand). This cap fits Toro Smart Stow models (e.g., 20333, 20334, 20340) and other Toro walk-behinds using Briggs & Stratton engines with part number 594061. It also works as a direct replacement for the OEM cap (Toro part 121-7947). Check the cap’s outer diameter (about 1.5 inches) and thread pitch—most Briggs & Stratton plastic fuel tanks use a standard 28mm thread. If your mower uses a metal tank or a different cap design (e.g., push-to-close or larger diameter), this will not fit. Measure your current cap’s thread width and count the threads per inch to confirm.

Key Things to Know

• Material: Aftermarket cap, often made of plastic with a rubber gasket. Some users report the gasket degrades faster than OEM, leading to leaks after a season or two.
• Installation: Tool-free, hand-tight only. Overtightening can crack the cap or tank neck.
• Venting: This cap includes a built-in vent. If your mower runs rough or stalls after replacing the cap, the vent may be clogged—blow through the cap to check.
• Common gotcha: The cap may sit slightly looser than OEM. If it wobbles or doesn’t seal snugly, replace the gasket or apply a small amount of fuel-resistant grease to the threads.

Should You Buy It

If you need a budget-friendly replacement for a lost or cracked cap on a Toro Smart Stow or compatible Briggs & Stratton mower, this is a solid option at under $10. It’s not built to OEM durability, so expect to replace it every 1–2 seasons—fine for occasional use, but skip it if you mow commercially or want a permanent fix.