Truck Stops
High-traffic areas where trucks are left overnight and targets are easy to identify.
Commercial Vehicle Security
Your Fuel Is Valuable. Why Leave It Unprotected?
CapLok Fuel Shield adds a rugged locked barrier around exposed commercial fuel caps, helping deter unauthorized access before fuel loss, downtime, and costly disruption occur.
Designed for compatible semi-trucks and commercial vehicles.
American Designed
Commercial Grade
Fleet Ready
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🏷 Labor Day Sale · Aug 31–Sep 8
Get Any Pair for $199.90 $149.95
Get any 2 CapLok Fuel Shields for $149.95. Add a third Fuel Shield and save 25% on the additional shield. Valid August 31 through September 8, 2026.
2 shields: LABORDAYPAIRDEAL
3 shields: LABORDAYTRIODEAL
Shop the Labor Day Sale →
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Industry Estimated Fuel Theft
$1.2+
Billion Fuel Stolen
Industry estimate includes physical fuel theft, fraud, misuse, and unauthorized fuel activity. Individual losses and risks vary.
Estimated annual losses from fuel theft, fraud, and unauthorized fuel use.
Commercial fleets are estimated to lose more than $1.2 billion annually to fuel theft, fuel fraud, misuse, and unauthorized fuel activity. An exposed fuel cap is one of the most easily overlooked vulnerabilities on a commercial truck.
The Vulnerability
An Exposed Fuel Cap Is an Open Point of Access
A commercial truck can carry hundreds or thousands of dollars in diesel fuel. When the fuel cap is exposed and unsecured, unauthorized access may be possible anywhere the vehicle is left unattended.
Fleet Yards
Parked equipment on large lots with limited overnight supervision.
Construction Sites
Remote locations with trucks parked unattended for extended periods.
Hotels & Rest Areas
Drivers sleeping while vehicles are exposed in parking areas.
Terminals
Staging areas where trucks wait between assignments.
Roadside Parking
Emergency stops and breaks that leave vehicles unmonitored.
Overnight Storage
Any location where a truck is left unattended through the night.
Remote Job Sites
Limited visibility and long distances from security resources.
Fuel theft does not only cost fuel. It can also create downtime, missed deliveries, emergency refueling, cleanup, and possible equipment damage.
The Math
CapLok Fuel Shield Can Cost Over 10x Less Than One Fuel-Theft Incident
One Fuel-Theft Incident May Include
- Stolen diesel fuel
- Emergency replacement fuel
- Driver downtime
- Delayed deliveries
- Lost productivity
- Possible fuel-cap or tank damage
- Cleanup costs
- Administrative time
CapLok Fuel Shield
- One-time security upgrade
- Locked external barrier
- Fast installation
- Heavy-duty construction
- Professional appearance
- Designed for daily commercial use
Secure the access point before you have to replace the fuel.
Shop CapLok →
Flagship Product
CapLok Fuel Shield
CapLok Fuel Shield
CapLok Fuel Shield is an external locking enclosure designed to surround and protect the fuel-cap access point on compatible semi-trucks and commercial vehicles.
- ✓Heavy-duty metal construction
- ✓CapLok Fuel Shield locking design
- ✓Helps deter unauthorized fuel access
- ✓Quick installation — no permanent modification on compatible applications
- ✓Weather-resistant design
- ✓Professional commercial appearance
- ✓Suitable for fleets and owner-operators
- ✓Replacement-key support
- ✓Potential keyed-alike fleet options
Compatibility
Built for
Freightliner
CapLok Fuel Shield has 109+ confirmed fitments across every major American semi brand — and may fit many more trucks not yet on the official list.
9
Truck Brands
109+
Confirmed Models
1967–Now
Year Range
Not sure if your truck is on the list?
Use the Fitment Finder →Installation
Three Steps to a More Secure Fuel Access Point
01
Place CapLok Fuel Shield
Place CapLok Fuel Shield around compatible external fuel caps. CapLok Fuel Shield is designed to fit securely around fuel caps on compatible commercial trucks.
02
Secure the Lock
Close and lock CapLok Fuel Shield around the gas cap. The spring loaded locking mechanism engages to create a physical barrier around the fuel cap.
03
Help Deter Unauthorized Access
The locked enclosure creates an additional physical barrier around the fuel cap, making the access point harder to target and more visible as protected.
Do Not Wait Until Fuel Is Missing
The best time to secure an exposed fuel cap is before the first theft attempt. CapLok Fuel Shield helps turn an easy access point into a harder, more visible target.
Fleet Solutions
Security for One Truck or an Entire Fleet
CapLok Fuel Shield is designed for operators of all sizes — from a single owner-operator truck to a national carrier fleet. Volume pricing, keyed-alike options, and fleet support are available.
Who We Serve
Owner-operatorsSmall fleetsNational carriersConstruction companiesAgricultural businessesMunicipal fleetsRental companiesLogistics providersHeavy-equipment operatorsand more
Fleet Benefits
- ✓Volume pricing on qualifying orders
- ✓Keyed-alike options where available
- ✓Centralized ordering and invoicing
- ✓Compatibility assistance for your specific fleet vehicles
- ✓Purchase-order support
The CapLok Fuel Shield Difference
Built for the Demands of Commercial Work
Every detail of the CapLok Fuel Shield is engineered around the real challenges faced by commercial vehicle owners and fleet operators.
Purpose-Built Security
Engineered specifically for commercial fuel-cap vulnerabilities — not a generic lock adapted for the application.
Rugged Construction
Heavy-duty metal construction built to withstand daily commercial use, outdoor exposure, and harsh working conditions.
Easy Installation
Fast installation on compatible vehicles with no permanent modification required — designed for minimal downtime.
Fleet-Ready
Scalable from single-truck owner-operators to national carriers with large fleets. Keyed-alike fleet options available.
Professional Support
Dedicated support for compatibility questions, fitment confirmation, fleet pricing, and dealer inquiries.
Replacement Parts
Replacement keys available to keep your CapLok Fuel Shield operational long-term.
Trusted Engineering
Designed with commercial-grade precision and tested for the demands of real working commercial vehicles.
Commercial-Grade Quality
Built to professional standards with materials and finishes appropriate for branded fleet vehicles.
Built to Protect
Engineered Around a Real-World Problem.
CapLok develops premium security products engineered to protect commercial vehicles and the businesses that rely on them.
Every product is designed with durability, simplicity, and long-term reliability in mind — purpose-built for the real demands of commercial vehicle operation.
CapLok designs and manufactures premium commercial vehicle security products focused on protecting valuable assets through rugged engineering and practical design.
