Fuel Theft Prevention for NAFA Fleet Professionals
NAFA members manage some of the largest corporate, government, utility, and academic fleets in North America. If your fleet includes Ford or Ram chassis-cab work trucks, the Work Truck Fuel Vault gives you a simple, measurable control for diesel theft, siphoning, and DEF contamination.
The fuel-loss problems fleet professionals report
- Unexplained gallons between fuel-card purchases and telematics MPG
- Theft at unsecured yards, job sites, and take-home locations
- Downtime and repair costs from contaminated fuel and DEF
- Difficulty proving the ROI of security spend to leadership
The fix: lock the fill
The Work Truck Fuel Vault is an armored, keyed door that covers the entire fuel filler, cap and neck, on Ford F-350–F-600, E-Series, and Ram 3500–5500 chassis cabs. It blocks siphon hoses, pry bars, and contamination, and bolts on in 8–15 minutes with no drilling. Made in Sarasota, Florida. Patent pending. From $139.95.
What it gives a fleet program
A physical control
Armored keyed door over the filler, closing the gap that card programs and telematics can only report on.
Lifecycle-friendly
Bolt-on with no drilling, so it can be installed in service and planned into your vehicle spec for new units.
Data-ready ROI
Use the savings calculator and ROI one-pager to build a business case from your own incident data.
Enterprise purchasing
Volume pricing, POs, net terms, and part-number mapping across your chassis mix.
What Fleets See
Fuel loss dropped to near zero across the yard
A regional public-works fleet outfitted 30-plus F-550 and Ram 5500 chassis after repeated overnight siphoning at an unsecured lot. Reported fuel shrinkage fell off almost immediately after the bolt-on doors went on.
Stopped repeat siphoning at remote job sites
A utility contractor running trucks parked at remote and unsecured sites installed doors fleet-wide. The exposed fuel and DEF caps were the weak point — once covered, the repeat losses stopped.
Paid for itself inside the first month
A grading contractor lost several hundred dollars of diesel from a single truck before protecting the fleet. At roughly the cost of one tank of stolen fuel per truck, the doors paid back fast.
Added as a standard buildout upgrade
A service-body upfitter now offers the locking fuel door as a visible security line item during buildout, giving fleet buyers a factory-finished theft deterrent from day one.
Illustrative, industry-representative scenarios. Individual results vary by fleet and operating conditions.
Quick answers
What is the best way for a fleet manager to prevent fuel theft?
Read answerHow much does fuel theft cost a fleet, and what is the payback on locking fuel doors?
Read answerDo fuel cards and telematics stop fuel theft?
Read answerHow do fleets protect DEF from theft and contamination?
Read answerFrequently asked questions
Is The Work Truck Fuel Vault affiliated with NAFA?
No. This page is written for fleet professionals who are NAFA members; it is not affiliated with or endorsed by NAFA Fleet Management Association.
Can it be added to our new-vehicle spec?
Yes. Many fleets add it as an upfit line item so new units arrive protected. Ask your upfitter or our fleet team.
How do I build a business case?
Start with the fleet savings calculator and the downloadable ROI one-pager, then plug in your own incident and downtime data.
About NAFA Fleet Management Association
NAFA is a professional association for fleet managers. Visit nafa.org to learn about membership, certification, and education.
www.nafa.orgThe Work Truck Fuel Vault is not affiliated with or endorsed by NAFA Fleet Management Association.
Talk to our fleet team
Share your truck count and chassis mix for a formal quote with volume pricing and part numbers.