Fuel Theft on Knapheide Trucks Is Preventable
Your Knapheide Body Locks the Tools. Who Locks the Fuel?
Knapheide service body trucks are high-value targets. Full diesel tanks, expensive tools, and overnight jobsite parking make them irresistible to fuel thieves. The Work Truck Fuel Vault stops fuel theft at the source — the exposed fuel cap.
Founders Edition pricing — starting at $139.95 (Save up to $60)
Knapheide Trucks Are Prime Targets
Thieves know Knapheide trucks. They know the diesel tank is full, the tools are valuable, and the fuel cap has zero protection. It's the easiest score on the jobsite.
- Knapheide trucks carry 40–68 gallons of diesel — a high-value target
- Fuel caps on the Ford/Ram chassis are completely exposed and unlocked
- Jobsite parking and fleet yard parking provide easy overnight access
- A single fuel theft costs $500–$1,000 including fuel and next-day downtime
- Multiple thefts per year across a Knapheide fleet cost thousands
- Locking gas caps provide 30 seconds of security — then the thief is in
Protect Your Knapheide Investment
You invested in a Knapheide because you want the best. Protect that investment with the Fuel Vault — the armored locking fuel door that stops diesel theft, siphoning, and contamination.
- Armored locking door covers the entire fuel filler area
- Tumbler lock + security torx — can't be gripped, pried, or picked
- Completely blocks siphoning — no hose gets in
- Prevents contamination — sugar, water, debris blocked
- Zero interference with any Knapheide body configuration
- Bolt-on in 8–15 minutes — no drilling, no mods
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.
Stop Fuel Theft on Every Knapheide Truck
Contractors
Your Knapheide truck sits at the jobsite. Stop the overnight siphoning.
Fleet Managers
Eliminate fuel theft across your entire Knapheide fleet.
Municipal
City Knapheide trucks in open yards need fuel theft prevention.
Utility
Remote Knapheide utility trucks are easy targets. Lock the fuel.
Knapheide Dealers
Include fuel theft prevention in every Knapheide delivery.
Night Parking
Any Knapheide truck parked overnight needs fuel protection.
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
Why are Knapheide trucks targeted for fuel theft?
Knapheide trucks are high-value commercial vehicles. Thieves know they carry full diesel tanks (40–68 gallons), expensive tools, and typically park at jobsites or in fleet yards overnight with exposed fuel caps.
Doesn't my Knapheide body have security?
Yes — for the body compartments. But the fuel cap is on the Ford or Ram chassis, not the Knapheide body. Neither Ford nor Ram includes any fuel security on chassis cab trucks.
How does the Fuel Vault prevent fuel theft?
An armored composite door covers the entire fuel filler area with a tumbler lock and security torx fasteners. Thieves cannot access, siphon, or contaminate the fuel.
Does it interfere with the Knapheide body?
No. The Fuel Vault mounts near the cab at the fuel filler neck. Zero interference with any Knapheide compartment, door, or panel.
What trucks does it fit?
Any Ford F-350 through F-600, E-Series, or Ram 3500–5500 chassis with a Knapheide body.
How much?
From $139.95 with free shipping. Pays for itself after one prevented theft.
Warranty?
Limited Lifetime Warranty and 30-day money-back guarantee.
Stop Fuel Theft on Your Knapheide — Starting at $139.95
Fuel theft prevention for Knapheide service body trucks. Armored. Locking. Bolt-on. Lifetime warranty.
Secure checkout • Free US shipping • No charge until your order ships
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