1pcs 692046 Fuel Tank Cap for B & S Intek Model Series 121600 Vertical, 3.5-6.75 HP Vertical Max

What It Is

This is a replacement fuel tank cap designed for Briggs & Stratton Intek engines, specifically the Model Series 121600 vertical shaft engines ranging from 3.5 to 6.75 HP. It seals the fuel tank to prevent leaks and debris entry during mowing or storage.

Fitment & Compatibility

• Engine series: Fits B&S Intek Model Series 121600 vertical engines only (not horizontal shaft models).
• Horsepower range: 3.5 HP to 6.75 HP vertical max.
• OEM reference: Replaces part number 692046. Confirm your original cap has this number stamped on it.
• Measurement check: Cap outer diameter is roughly 2.2 inches; thread pattern is specific to B&S plastic tanks. If your tank neck is metal or a different brand, it likely won’t fit.
• Deck size irrelevant: This cap fits the engine tank, not the mower deck.

What to check before buying: Look at the cap you’re replacing for “692046” or “Briggs & Stratton” markings. Measure the cap diameter and compare to your tank opening. If your current cap is cracked or missing threads, match the thread pitch by trying a known B&S cap.

Key Things to Know

• Quality: Aftermarket cap, not OEM. Some users report a slightly looser fit than original, but it seals adequately for most residential use.
• Installation: No tools needed—just twist on hand-tight. Overtightening can crack the cap or tank neck.
• Common gotcha: If your tank is old or warped, even a new cap may not seal perfectly. Inspect the tank rim for cracks or distortion first.
• Venting: This cap is vented (allows air in as fuel is used). If you smell gas or see leaks, check that the vent isn’t clogged by dirt.

Should You Buy It

If you need a cheap, functional replacement for a lost or broken B&S Intek cap and don’t mind a non-OEM fit, this is a solid value at $7.28. It’s best for residential mowers with light use. For commercial or high-vibration applications, spending a few dollars more on an OEM cap may give better durability and a tighter seal.