594061 Replacement Cap for Lawn Mower, Compatible with B&S 675EXi 725EXi Series Engines, Replaces 594061 597414 84004416, with Tether and Gasket, 1 Pack Review

Overview

This isn’t a lawn mower itself, but a critical replacement part: the 594061 fuel cap assembly for Briggs & Stratton 675EXi and 725EXi series engines. Designed for homeowners who own a mower with one of these common engines, this $7.49 cap replaces worn or lost caps that cause fuel leaks, evaporation, or starting issues. If your mower is sputtering, leaking gas from the cap, or you’ve simply lost the tether, this is the exact fix you need.

Who Should Buy This

• Owners of B&S 675EXi or 725EXi engines – These engines power countless push mowers from brands like Troy-Bilt, Craftsman, and Husqvarna. If your cap is cracked, missing the tether, or won’t seal, this is your direct replacement.
• Homeowners who store mowers in sheds or garages – A bad cap can leak fuel vapors or raw gas, creating a fire hazard and stinking up your storage space. This cap seals tight.
• DIY repair folks skipping the dealer – At $7.49, this is a fraction of what a dealer would charge for a branded OEM cap. If you’re comfortable turning a wrench and replacing a simple part, this saves you a trip.
• Anyone who lost the tether – The included tether keeps the cap attached to the fuel tank, so you won’t drop it in the grass or misplace it mid-mow. That’s a small but real convenience.

Key Features Breakdown

• Compatibility with B&S 675EXi and 725EXi Series – This is the most important spec. These two engine families are used on millions of mowers. The cap fits the specific fuel tank neck design, thread pitch, and venting requirements of these engines. Don’t assume it fits other B&S models—check your engine’s model number.
• Replaces 594061, 597414, 84004416 – These three OEM part numbers cover multiple years and revisions of the same cap. If your mower’s cap is one of these, this is a direct swap. No guesswork.
• Includes Tether and Gasket – The tether is a plastic strap that clips to the tank, preventing loss. The gasket is a rubber O-ring that creates the seal. Both are included, so you don’t need to buy extras or reuse old, worn parts.
• 1 Pack – You get one cap. For most users, that’s all you need. But if you have multiple mowers with the same engine, buy two—they’re cheap enough.
• Price: $7.49 – At this price, it’s a no-brainer repair. Compare to a dealer’s $15–$20 OEM cap. The trade-off is that this is an aftermarket part, not a genuine Briggs & Stratton product.

Pros

• Exact fit for common B&S engines – No modification needed. It threads on smoothly and seals properly on 675EXi and 725EXi fuel tanks.
• Includes the tether – Many replacement caps skip this, leaving you to jury-rig something. This one has it, so your cap stays put.
• Gasket pre-installed – The rubber O-ring is already in place, ready to seal. No extra step to install it.
• Very affordable – Under $8 for a part that solves a frustrating problem (fuel smell, leaks, hard starting) is a bargain.
• Simple DIY install – Unscrew the old cap, screw on the new one. No tools needed. Anyone can do it in under a minute.
• High customer satisfaction – 4.2 stars from over 1,100 reviews suggests most buyers get a reliable, working cap.

Cons

• Aftermarket quality control – Some users report the cap doesn’t vent properly, causing vacuum lock in the tank and stalling. This is sporadic, but worth noting. If you get a defective one, return it.
• Tether can feel flimsy – The plastic tether is functional but not heavy-duty. It may break after a season or two if you’re rough with it.
• Not a genuine B&S part – If you’re a stickler for OEM, this isn’t it. The fit is fine, but the plastic and rubber may not last as long as the original.
• May not fit older revisions – While it replaces 594061, 597414, and 84004416, there are subtle variations in tank necks. Double-check your mower’s model before buying.

Bottom Line

If your Briggs & Stratton 675EXi or 725EXi mower has a leaking, missing, or worn-out fuel cap, this $7.49 replacement is a practical, low-risk fix. It fits well, seals tightly, and includes the tether and gasket—everything you need in one package. The only real downside is that it’s aftermarket, so occasional quality issues pop up, but the overwhelmingly positive reviews suggest most buyers are satisfied. For the price, it’s a smart first try before spending double at a dealer. I recommend it for any DIY homeowner with these engines.

Frequently Asked Questions

Q: Will this cap fit my B&S 500EXi or 550EXi engine?
A: No. This cap is specifically designed for the 675EXi and 725EXi series. The 500EXi and 550EXi use a different fuel tank neck and cap. Check your engine’s model number before ordering.

Q: My mower starts but stalls after a few minutes. Could this cap be the problem?
A: Yes, if the cap’s vent is clogged, it can create a vacuum in the tank that stops fuel flow. Try loosening the cap slightly when it stalls—if the engine runs fine, the vent is bad. This replacement cap should fix that.

Q: Do I need to replace the gasket separately?
A: No. The cap comes with the gasket (O-ring) already installed. Just screw it on snugly—don’t overtighten, or you can damage the seal.