Box Truck Fuel Cap Cover — Lock It Down
Delivery Routes • Overnight Parking • Zero Fuel Security
Box trucks park in loading docks, city streets, and warehouse lots — often overnight, often unattended. The fuel cap is completely exposed. The Work Truck Fuel Vault is the locking fuel cap cover built for box truck fleets.
Founders Edition pricing — starting at $139.95 (Save up to $60)
Box Trucks Park Everywhere
Box trucks have some of the most exposed parking situations in the commercial fleet world. Delivery routes, urban parking, loading docks — all with an exposed fuel cap.
- Box trucks park overnight on streets, lots, and loading docks
- Fuel caps on E-350, E-450, and F-series box trucks are completely exposed
- Delivery routes take trucks through high-theft areas
- Box truck fuel tanks carry 40–55 gallons of diesel
- No factory fuel door or cover exists on any box truck chassis
- Locking caps are defeated in seconds — not designed for commercial use
Lock the Fuel on Your Box Truck
The Fuel Vault adds the locking fuel door your box truck needs. Armored, tamper-resistant, and bolt-on.
- Armored locking door over the entire fuel filler area
- Tumbler lock + security torx — tamper-resistant hardware
- Fits Ford E-350, E-450, F-550, F-600, and Ram 5500 box truck chassis
- Compatible with Morgan Olson, Supreme, Unicell, and all box bodies
- Bolt-on in 8–15 minutes — no drilling or cutting
- Made in the USA with Limited Lifetime Warranty
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.
Box Truck Operators Who Need This
Delivery Fleets
Lock the fuel on every delivery box truck. Stop fuel theft across routes.
Moving Companies
Box trucks park at customer sites overnight. Lock the fuel.
Government
Municipal box trucks need locked fuel caps.
Supply Chain
Protect fuel on warehouse and distribution box trucks.
Fleet Upfitters
Add a fuel door to every box truck build.
E-Commerce
Last-mile delivery trucks need fuel security in every neighborhood.
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
Does the Fuel Vault fit box trucks?
Yes. The Fuel Vault fits Ford E-350, E-450, and F-550/F-600 based box trucks, as well as Ram 5500 box truck chassis. It mounts at the fuel filler near the cab.
Which box truck bodies is it compatible with?
Morgan Olson, Supreme, Unicell, Utilimaster, and all other box bodies built on supported chassis. The Fuel Vault mounts to the chassis, not the body.
Why do box trucks need a fuel cap cover?
Box trucks often make deliveries and park in public areas overnight. The fuel cap is exposed and easily accessed. A fuel cap cover prevents theft and contamination.
How does it install?
Bolt-on in 8–15 minutes with basic hand tools. No drilling or cutting.
How much?
From $139.95 with free shipping.
Warranty?
Limited Lifetime Warranty and 30-day money-back guarantee.
Lock Your Box Truck Fuel — Starting at $139.95
Box truck fuel cap cover for Ford and Ram chassis. Bolt-on. No drilling. Lifetime warranty.
Secure checkout • Free US shipping • No charge until your order ships