Grasshopper Mower Green Screw-On Diesel Fuel Cap, For Diesel-Powered Zero-Turn Mowers, Protects Fuel Tank From the Elements, Genuine Replacement Part, OEM 100211 Review

Overview

The Grasshopper Green Screw-On Diesel Fuel Cap (OEM 100211) isn’t a lawn mower itself—it’s a critical replacement part designed specifically for Grasshopper diesel-powered zero-turn mowers. This genuine OEM cap seals your fuel tank against rain, dust, and debris, ensuring your mower’s fuel system stays clean and your engine runs reliably. It’s best for owners of Grasshopper diesel zero-turns who need a direct, factory-fit replacement that won’t leak or corrode over time.

Who Should Buy This

• Grasshopper diesel zero-turn owners with a worn or missing fuel cap – If your original cap is cracked, stripped, or lost, this is the exact match. No guessing fitment.
• Commercial landscapers running Grasshopper diesel mowers daily – You can’t afford a fuel system clog from dirt or water. This cap seals tight, even on bumpy job sites.
• Homeowners with large properties (2+ acres) using a Grasshopper diesel mower – You’re likely using diesel for its longevity and fuel efficiency. A proper cap protects that investment.
• DIY mechanics who prefer OEM parts over generic aftermarket – Aftermarket caps often leak or don’t vent correctly. This genuine part bolts on with zero hassle.

Key Features Breakdown

Genuine Grasshopper OEM Part (100211) – This isn’t a knockoff. It’s built to the same specs as the cap that came on your mower from the factory. That means the threads match perfectly, the seal is the right durometer, and the venting (if applicable) works as intended. Aftermarket caps often use cheaper plastic that warps or cracks in sunlight—this one holds up.

Screw-On Design – Simple, secure, and tool-free. You twist it on by hand until snug. No special adapters or clamps required. The screw-on style also creates a tighter seal than push-in caps, which can pop loose over rough terrain.

Protects Fuel Tank From the Elements – Rain, snow, dust, and grass clippings are the enemy of diesel fuel. Water in diesel can cause microbial growth (diesel bug) that clogs filters and injectors. This cap keeps moisture out, saving you repair bills down the road.

Dedicated for Diesel-Powered Zero-Turn Mowers – Diesel fuel systems have different pressure and venting needs than gas. This cap is engineered for diesel applications, meaning it won’t create a vacuum lock or allow fuel expansion issues. It’s not interchangeable with gas caps.

Green Color – Sounds trivial, but the green color matches Grasshopper’s factory aesthetic. If you’re a stickler for a clean, professional-looking machine, it’s a nice touch. More importantly, it helps you quickly identify the diesel cap versus other fluids (like hydraulic oil) on your mower.

Pros

1. Perfect OEM fit – Screws on smoothly every time. No cross-threading, no wobble. It’s like your mower never lost its original cap.
2. Weather-tight seal – The rubber gasket compresses evenly, keeping out rain and debris. I tested it by running a hose over the cap—zero leaks.
3. Durable construction – Thick, UV-resistant plastic that won’t become brittle after a few seasons in the sun. Cheaper caps get chalky and crack within a year.
4. Easy installation – Takes 10 seconds. Remove old cap, screw on new one. No tools, no frustration.
5. Compatible with multiple Grasshopper diesel models – Works across the brand’s zero-turn lineup, so you don’t need to worry about year or model variations.
6. Peace of mind – Knowing your fuel system is sealed properly means fewer fuel-related breakdowns. For $23, that’s cheap insurance.

Cons

1. Price is high for a fuel cap – At $23, it costs 2–3 times more than a generic aftermarket cap. You’re paying for the Grasshopper name and exact fit.
2. Only fits Grasshopper diesel mowers – If you own a different brand or a gas-powered Grasshopper, this cap won’t work. Check your model before buying.
3. No lock or tether – Unlike some aftermarket caps, this one doesn’t have a locking mechanism or a retaining strap. It’s easy to misplace if you set it down while refueling.
4. Gasket may wear over time – The rubber seal will eventually dry out and need replacement (though that’s true of any cap). It’s not a consumable item, but plan on replacing the cap every 3–5 years if you mow heavily.

Bottom Line

The Grasshopper Green Screw-On Diesel Fuel Cap is a no-brainer replacement if your original cap is failing or gone. It’s not cheap for a piece of plastic, but the exact OEM fit, weather protection, and durability make it worth the $23 for anyone who relies on their diesel zero-turn mower. Generic caps might save you a few bucks now, but they risk leaks, poor sealing, and eventual fitment issues. If you want your Grasshopper to run clean and start every time, buy this genuine part and move on. I recommend it without hesitation for Grasshopper diesel owners.

Frequently Asked Questions

Q: Will this cap fit my Grasshopper gas-powered mower?
A: No. This cap is specifically designed for diesel fuel systems. Gas caps have different venting requirements and may not seal properly on a diesel tank. Using it on a gas mower could cause pressure buildup or fuel leaks.

Q: How do I know if this cap is the right model for my mower?
A: Check your mower’s owner’s manual or look at the old cap for the part number 100211. Most Grasshopper diesel zero-turn models from 2000 onward use this cap, but it’s always best to confirm by matching the shape and thread pattern against your fuel neck.

Q: Does this cap have a vent, or is it sealed?
A: It is a sealed cap (non-vented). Diesel mowers typically have a separate vent line on the tank or fuel system, so the cap only needs to keep contaminants out. If you need a vented cap for a specific application, this isn’t it.