Briggs & Stratton 594061 Lawn & Garden Equipment Engine Fuel Tank Cap Genuine Original Equipment Manufacturer (OEM) Part

What It Is

The Briggs & Stratton 594061 is a genuine OEM fuel tank cap designed to seal the fuel tank on Briggs & Stratton lawn and garden engines. It prevents fuel evaporation, dirt ingress, and leaks, and is commonly used on walk-behind mowers, riding mowers, and other small engine equipment.

Fitment & Compatibility

• Engine brand: Briggs & Stratton only. Not compatible with Kohler, Kawasaki, or Honda engines.
• Models: Fits many Briggs engines from the 1980s onward, including the 400000, 420000, 440000, and 450000 series, plus many Intek, Vanguard, and Quantum models.
• Measurements: Cap diameter is approximately 1.5 inches (38mm) – measure your old cap’s outer diameter to confirm.
• Check: Look for the part number 594061 on your current cap or in your engine manual. Also verify the tank neck is not cracked or deformed; a damaged neck can prevent a proper seal.
• OEM vs aftermarket: This is a genuine OEM part, which ensures exact fit and proper venting. Aftermarket caps may vary in thread pitch or seal quality.

Key Things to Know

• Quality: Made by Briggs & Stratton, so it fits and seals as intended. The built-in vent prevents pressure buildup and fuel starvation.
• Installation: Dead simple – just unscrew the old cap and screw on the new one. No tools required.
• Common gotcha: If your old cap is stuck, don’t force it – use a strap wrench or penetrating oil to avoid damaging the tank neck.
• Durability: The cap’s plastic and rubber seal hold up well, but the seal can degrade over time with ethanol-blended fuels. Expect 2-4 years of typical use.

Should You Buy It

Yes, if you need a direct replacement for a worn or leaking Briggs & Stratton fuel cap and want guaranteed fit and reliable sealing. It’s the right choice for most Briggs-powered mowers and tractors, especially if you value OEM quality over saving a couple bucks on a generic cap.