Monroe Locked Every Compartment. Now Cover the Fuel Cap.
Tools Secured ✓ • Body Locked ✓ • Fuel Cap Wide Open ✗
Monroe truck bodies come with locks on every door and compartment. But the Ford or Ram chassis underneath has a completely exposed fuel cap. The Work Truck Fuel Vault is the armored locking cover that shields the entire fuel filler area on your Monroe-equipped work truck.
Founders Edition pricing — starting at $99.95 (Save up to $50)
The Exposed Fuel Cap on Every Monroe Truck
Monroe builds tough bodies with security in mind. But the chassis fuel cap is Ford's or Ram's responsibility — and they left it wide open.
- Ford and Ram chassis cabs ship with zero fuel cap protection
- Monroe body locks protect tools and cargo — nothing covers the diesel cap
- Thieves know Monroe trucks carry full tanks and expensive equipment
- A single siphoning costs $500–$1,000 in fuel plus job downtime
- Aftermarket locking gas caps are defeated in seconds with pliers
The Armored Fuel Cap Cover for Monroe Trucks
The Work Truck Fuel Vault covers and locks the entire fuel filler area on the chassis under your Monroe body.
- Armored door covers the entire fuel filler area — cap, neck, and access point
- Compatible with all Monroe truck body models — zero interference
- Bolt-on install in 8–15 minutes — no drilling or cutting
- Purpose-built for Ford F-350–F-600, E-Series, F53 and Ram 3500–5500
- UV-stable composite — built for year-round outdoor exposure
- Limited Lifetime Warranty and 30-day money-back guarantee
The Part The Factory Forgot
The Work Truck Fuel Vault is an armored, locking fuel door that covers the entire fuel access area on your work truck. No more exposed caps. No more easy targets.
Why Didn't This Exist Before?
Despite billions lost to fuel theft every year, nobody built a real solution for commercial work trucks. Here's why.
"Good Enough" Thinking
The industry defaulted to cheap aftermarket locking gas caps. A $15 key-locked cap was considered good enough — until thieves proved otherwise with a pair of pliers.
Upfitters Focus on the Body, Not the Cap
Manufacturers like Knapheide and Reading engineer every compartment lock on the service body — but the chassis fuel pocket belongs to Ford or Ram. Nobody owned the gap.
The Zero-Drill Engineering Problem
Consumer billet doors are made for flat pickup beds. The recessed fuel pocket on a commercial chassis is a completely different geometry — and drilling risks voiding the chassis warranty.
The Cost Was Just "Absorbed"
Fleets treated fuel theft like weather damage. A $500 siphoning hit got buried in operating expenses. Without a purpose-built product available, the problem was simply accepted.
The Work Truck Fuel Vault is the industry's first drop-in armored fuel door that uses existing factory mounting points. No drilling. No cutting. No warranty risk.
Every Monroe Truck Needs a Fuel Cap Cover
Contractors
Monroe Tradesman on an F-550. Compartments locked. Fuel cap exposed. The Fuel Vault fixes that.
Municipal Fleets
City Monroe trucks in open yards overnight. Cover the fuel cap like Monroe covers the tools.
Utility Crews
Monroe utility bodies on Ram chassis. Lock the fuel alongside the equipment.
Monroe Dealers
Bundle the Fuel Vault with every Monroe upfit. Real value your customers need.
Fleet Managers
Standardize fuel cap covers across your Monroe fleet. Volume pricing available.
Remote Sites
Monroe trucks on remote jobsites need fuel protection around the clock.
Chassis Compatibility
Purpose-built for the most popular commercial chassis platforms in the industry.
Ford
Super Duty & Commercial Chassis
- F-350 Chassis Cab
- F-450 Chassis Cab
- F-550 Chassis Cab
- F-600 Chassis Cab
- E-350 / E-450
- F53 Workhorse
Ram
Chassis Cab Heavy Duty
- Ram 3500 Chassis Cab
- Ram 4500 Chassis Cab
- Ram 5500 Chassis Cab
Locking Fuel Cap vs. Fuel Vault
See how The Work Truck Fuel Vault compares to the alternatives.
| Feature | Locking Fuel Cap | The Work Truck Fuel Vault |
|---|---|---|
| Protection Type | Cap only | Full armored cover over entire fuel access |
| Tamper Resistance | Low — pliers defeat it | High — armored composite, torx fasteners |
| Covers Fuel Filler Area | No | Yes — full hatch coverage |
| Prevents Siphoning | Partial | Yes — sealed cover blocks all access |
| Monroe Compatible | Generic fit | Purpose-built for Ford & Ram chassis under Monroe |
| Warranty | None or 90 days | Limited Lifetime Warranty |
Feature comparison between standard locking fuel cap and The Work Truck Fuel Vault
Protection Type
Cap only
Full armored cover over entire fuel access
Tamper Resistance
Low — pliers defeat it
High — armored composite, torx fasteners
Covers Fuel Filler Area
No
Yes — full hatch coverage
Prevents Siphoning
Partial
Yes — sealed cover blocks all access
Monroe Compatible
Generic fit
Purpose-built for Ford & Ram chassis under Monroe
Warranty
None or 90 days
Limited Lifetime Warranty
Our Guarantee
Limited Lifetime Warranty
Built to last. Warranted against defects in material and workmanship for the life of the vehicle on which it was originally installed.
30-Day Money Back
Not satisfied? Return within 30 days of receipt for a full refund. No questions asked.
Free Replacements
If your Fuel Vault is defective under normal use within the warranty period, we replace it at no charge.
Frequently Asked Questions
Does the Fuel Vault fit trucks with Monroe truck bodies?
Yes. The Fuel Vault mounts to the Ford or Ram chassis at the fuel filler area — not the Monroe body. Fits any Ford F-350 through F-600, E-Series, or Ram 3500–5500 chassis with any Monroe body.
Will it interfere with Monroe compartment doors?
No. The Fuel Vault mounts near the cab at the fuel filler neck. Monroe body compartments and storage remain completely unaffected.
What Monroe models does it work with?
All of them — ServicePRO, Tradesman, Extreme Landscape, and every other Monroe configuration.
How does it install?
Bolt-on in 8–15 minutes with basic hand tools. No drilling, cutting, or body modifications.
How much does it cost?
Founders Edition starts at $99.95 with free shipping.
Is there a warranty?
Yes — Limited Lifetime Warranty and a 30-day money-back guarantee.
Cover the Fuel Cap on Your Monroe Truck — Order Now
Monroe locked every compartment. The Fuel Vault covers the one thing they couldn't.
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