The Locking Fuel Cap Cover That Covers Everything
Not Just the Cap — The Entire Fuel Filler Area
A locking fuel cap covers the cap. A locking fuel cap cover covers everything. The Work Truck Fuel Vault is the full-coverage locking fuel cap cover for commercial chassis cabs.
Founders Edition pricing — starting at $99.95 (Save up to $50)
A Locking Cap Covers Almost Nothing
Most fuel security products only protect the cap opening. The filler neck, access area, and surrounding surface remain completely exposed.
- Locking caps protect the cap opening only — not the filler area
- Thieves access the filler neck by removing or bypassing the cap
- Siphoning hoses reach past the cap into the filler neck
- Contaminants enter around the filler area, not just the cap
- No factory fuel cap cover exists for commercial chassis cabs
- Universal caps don't provide full-coverage protection
Full-Coverage Protection
The Work Truck Fuel Vault is the locking fuel cap cover that actually covers everything. Not just the cap — the entire fuel filler area.
- Full coverage over the cap, filler neck, and surrounding access area
- Tumbler lock with security torx fasteners
- Armored UV-stable composite construction
- Bolt-on in 8–15 minutes — no drilling or cutting
- Fits Ford F-550, F-600, E-350, E-450, and Ram 5500
- Made in the USA — Sarasota, Florida
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.
Who Needs a Locking Fuel Cap Cover
Contractors
Cover and lock the fuel cap area on your service truck.
Fleets
Fleet-wide fuel cap covers — full coverage, every truck.
Government
Municipal trucks need full-coverage locking fuel cap covers.
Utility
Cover the fuel cap on every utility truck in the field.
Upfitters
Add a locking fuel cap cover during the body build.
Owner-Operators
Full coverage, real lock, done in 15 minutes.
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
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
What is a locking fuel cap cover?
A locking fuel cap cover is an enclosure that mounts over the fuel filler cap and locks to prevent unauthorized access. The Fuel Vault is a full-coverage locking fuel cap cover that protects the cap, filler neck, and surrounding area.
How is this different from a locking cap?
A locking cap only replaces the cap itself. A locking fuel cap cover is a separate enclosure that covers the entire area — providing far more protection against theft, siphoning, and contamination.
What trucks does it fit?
Ford F-550, F-600, E-350, E-450, and Ram 5500 chassis cabs with any body type.
Does it require drilling?
No. Bolt-on install in 8–15 minutes.
How does it lock?
Tumbler lock with security torx fasteners. Tamper-resistant.
How much?
From $99.95 with free shipping.
Warranty?
Limited Lifetime Warranty and 30-day money-back guarantee.
Get Full-Coverage Protection — Starting at $99.95
Locking fuel cap cover for Ford and Ram chassis cabs. Covers the entire filler area. Bolt-on. No drilling.
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