Rotary Fuel Cap Replaces Briggs & Stratton 298425, 493982 and 493982S

What It Is

This is a rotary-style fuel cap designed to replace Briggs & Stratton OEM part numbers 298425, 493982, and 493982S. It seals the fuel tank on lawn mowers, tractors, and small engines to prevent leaks and fuel evaporation.

Fitment & Compatibility

Before buying, verify your engine’s model and spec numbers (found on the valve cover or blower housing). This cap fits many Briggs & Stratton engines (e.g., 8–20 HP Vanguard, Intek, and single-cylinder series) but is not universal. Measure the fuel tank neck opening: it must be a standard 1.5-inch diameter. Check that your old cap has a vented design (most do) – this replacement is vented. If your mower uses a non-vented cap (rare on newer models), this won’t work. Confirm the cap’s thread pattern matches your tank; it uses standard right-hand threads. Aftermarket caps may have slight color or material differences from OEM but fit identically.

Key Things to Know

• Quality: Made from durable plastic with a rubber gasket that seals well; most users report no leaks or cracking. It’s a solid aftermarket alternative to OEM at half the price.
• Installation: Tool-free – simply unscrew the old cap and screw on the new one. No gasket sealant needed.
• Common gotchas: If the cap feels loose, the gasket may be misaligned – reseat it. Vented caps can occasionally clog; blow out the vent hole if fuel flow issues arise. Ensure the cap is fully tightened to avoid vibration loosening.
• Venting: This cap has a built-in vent that allows air into the tank. If your engine runs rough or stalls after install, check the vent is clear (a small hole on top).

Should You Buy It

Yes, if you need a direct replacement for a leaking or broken fuel cap on a Briggs & Stratton engine that matches the listed part numbers. It’s affordable, easy to install, and reliable for most residential mowers. Skip it if your mower uses a non-standard tank size or requires a non-vented cap.