Maxpower 334228 Gas Cap for Briggs & Stratton

What It Is

The Maxpower 334228 is a replacement gas cap designed for Briggs & Stratton engines, commonly used on walk-behind mowers, tractors, and other small outdoor power equipment. It seals the fuel tank to prevent leaks and contamination.

Fitment & Compatibility

• OEM cross-reference: Replaces Briggs & Stratton part numbers 334228, 593976, and 590597. Check your engine’s part number on the cap or fuel tank.
• Engine types: Fits most Briggs & Stratton single-cylinder engines (e.g., 450, 500, 550, 625, 675, 725, 850, 875 series). Not for all models—verify your engine model number (stamped on the blower housing or valve cover).
• Physical check: Cap diameter is approximately 1.5 inches. Measure your current cap’s diameter and thread pattern. The Maxpower cap uses a standard threaded design, but some Briggs tanks use a bayonet-style cap—this will not fit those.
• Aftermarket note: This is an aftermarket part, not OEM. It meets or exceeds OEM specs, but fitment may vary on older or non-standard tanks.

Key Things to Know

• Quality: Users report a snug, leak-free seal. The cap is made of plastic with a rubber gasket. Inspect the gasket before installation—if dry or cracked, replace it.
• Installation: Simple—twist off old cap, twist on new one. No tools needed. Ensure it’s hand-tight; overtightening can strip the threads.
• Common gotcha: Some Briggs tanks have a vented cap. This Maxpower cap is non-vented. If your engine requires a vented cap (e.g., for pressure equalization), this will cause fuel starvation or a vacuum lock. Check your old cap for a small hole or vent symbol.
• Durability: Holds up well to sun and fuel exposure, but the plastic can become brittle in extreme cold. Store mower indoors if possible.

Should You Buy It

If you need a direct, affordable replacement for a standard non-vented Briggs & Stratton gas cap and your engine model is in the compatible series, this is a solid pick. It’s cheap, easy to install, and does the job. Skip it if your cap is vented or if you need a bayonet-style cap—check your old cap carefully first.