594061 Fuel Tank Cap Gas Cap Replacement for B&S 675EXi 725EXi Engines, Fit for Toro, Craftsman, and Troy Bilt Lawn Mower

What It Is

This is a replacement fuel tank cap (part number 594061) for B&S 675EXi and 725EXi engines. It seals the gas tank to prevent fuel leaks and debris entry, commonly used on walk-behind mowers with these specific Briggs & Stratton engines.

Fitment & Compatibility

• Engines: B&S 675EXi (model 12A-xxx) and 725EXi (model 12B-xxx) only. Not for other B&S series like 500e or 850.
• Brands: Fits Toro (TimeCutter, Recycler), Craftsman (t-series, m-series), and Troy-Bilt (TB, Pony models) with those engines. Also compatible with Husqvarna, Poulan Pro, and Murray mowers using the same engine.
• Check before buying: Measure your current cap’s outer diameter (must be ~1.25 inches) and thread pitch (standard 1/4 turn). Look for the engine model number on the valve cover or under the spark plug. This cap is aftermarket, not OEM—expect minor differences in plastic quality or seal thickness.
• Not for: Zero-turn mowers with larger tanks, or any engine without the EXi suffix (e.g., B&S 675 without EXi uses a different cap).

Key Things to Know

• Quality: Mixed reviews—some report a tight fit, others say the seal leaks after a few months. Check the O-ring is seated correctly before installation.
• Installation: No tools needed. Hand-tighten until snug; overtightening can crack the plastic.
• Common gotcha: The cap may not vent properly if the tank is overfilled—leave a 1-inch gap at the top when refueling. Some users needed to sand down the inner lip slightly for a secure seal.
• Durability: UV exposure may cause cracking within 1-2 seasons. Store mower out of direct sun to prolong life.

Should You Buy It

This cap is a budget-friendly stopgap for a lost or damaged original, but don’t expect long-term reliability. If you need a perfect seal for daily commercial use or a zero-tolerance fit, buy OEM. For occasional home mowing on a tight budget, this will get you through a season or two.