A Fuel Door Lock Thieves Can't Defeat
Tumbler Lock • Security Torx • Armored Composite Door
A lock is only as good as the door behind it. The Work Truck Fuel Vault combines a high-quality tumbler lock with security torx fasteners and an armored composite door — the most tamper-resistant fuel door lock on the market.
Founders Edition pricing — starting at $99.95 (Save up to $50)
Most Fuel Locks Are a Joke
Locking gas caps use a tiny key cylinder in a plastic housing. A thief with pliers defeats it in under 30 seconds. That's not security — that's theater.
- Locking gas cap lock cylinders are small and easily bypassed
- Plastic cap housings crack and break under force
- Exposed bolt heads can be gripped and removed with pliers
- No standard locking cap prevents siphoning — a hose bypasses the lock
- Universal-fit caps wobble and create gaps that allow contamination
- Replacement locks are needed every few months as they degrade
A Lock Worth Trusting
The Fuel Vault fuel door lock system combines three layers of security: a tumbler lock, security torx fasteners, and an armored composite enclosure.
- Tumbler lock — pick-resistant with precision internals
- Security torx fasteners — require specialty bit, no standard tools work
- Armored composite door — high-strength, UV-stable, impact-resistant
- Recessed lock cylinder — no exposed hardware to grip or pry
- Full filler area coverage — locks the cap, neck, and access point
- Bolt-on in 8–15 minutes — no drilling or body modifications
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 Serious Fuel Door Lock
Contractors
Your truck parks at the jobsite. A serious lock keeps your fuel secure overnight.
Fleet Managers
Standardize tamper-resistant fuel door locks across your fleet.
Municipal
Public fleet trucks need locks that withstand deliberate tampering.
Utility
Remote parking, overnight exposure — your fuel door lock needs to hold up.
Upfitters
Add a professional-grade fuel door lock to every chassis cab build.
Security-Conscious
Insurance documentation, compliance, peace of mind — it all starts with a real lock.
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 kind of lock does the Fuel Vault use?
The Fuel Vault uses a high-quality tumbler lock combined with security torx fasteners. The lock is recessed and the fasteners require a specialty bit — no exposed bolts to grip or pry.
Can the lock be picked?
The tumbler lock is pick-resistant, and the security torx fasteners add a second layer of tamper resistance. Combined with the armored composite door, the system is designed to deter and delay.
How many keys does it come with?
The Fuel Vault comes with two keys per lock. Additional keys can be ordered for fleet convenience.
Can I key all my trucks the same?
Fleet keying options are available for orders of 5+ units. Contact us for details on same-key fleet orders.
What trucks does it fit?
Ford F-550, F-600, E-350, E-450, and Ram 5500 chassis cabs.
How much does it cost?
Founders Edition starts at $99.95 with free shipping.
Is there a warranty?
Limited Lifetime Warranty and 30-day money-back guarantee.
Get a Fuel Door Lock That Works — Starting at $99.95
Tumbler lock. Security torx. Armored door. The most tamper-resistant fuel door lock for work trucks.
Secure checkout • Free US shipping • No charge until your order ships
Related Pages
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Best accessories for Knapheide service bodies.
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Learn MoreFuel Cap Lock
Lock your fuel cap on Ford and Ram work trucks.
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