Briggs & Stratton Genuine Fuel Tank Cap 596250

What It Is

The Briggs & Stratton Genuine Fuel Tank Cap 596250 is the OEM replacement cap designed to seal the fuel tank on many Briggs & Stratton engines, preventing fuel leakage and debris entry. It’s for push mowers, riding mowers, and small engines that use the original cap.

Fitment & Compatibility

Before buying, verify your engine’s model number (on the engine shroud, often near the spark plug). This cap fits Briggs & Stratton engines with a standard 1.5-inch (38mm) fuel tank neck opening. It’s not universal—check if your current cap’s inner diameter matches. It replaces OEM part 596250 and supersedes earlier caps like 699304. Avoid aftermarket “universal” caps if you want a guaranteed seal. Measure your tank neck’s outer diameter; if it’s ~1.5 inches, this cap fits. Not for all brands—only Briggs engines.

Key Things to Know

• Quality: Genuine Briggs part, not aftermarket. It’s vented (no separate vent line needed) and includes a rubber gasket for a tight seal. Expect long life.
• Installation: Easy—twist on until snug. No tools needed. Ensure the gasket is seated and the cap clicks (vents) properly.
• Common gotcha: If your old cap was loose or leaked, the gasket may be worn. This cap solves that, but check the tank neck for cracks or debris first.
• Gotcha #2: Some users report the cap is stiff to twist at first; it loosens with use. Don’t overtighten—just hand-tight.

Should You Buy It

Buy this if you need a reliable, OEM-sealed fuel cap for a Briggs & Stratton engine and want to avoid leaks or vent issues. It’s a simple, low-cost fix that fits most standard Briggs tanks. Skip it if your engine is a non-Briggs brand or you need a non-vented cap for a specific application.