GMC Sierra 3500HD Chassis Cab Locking Fuel Door
2015–2026 GMC Sierra 3500HD Chassis Cab — exposed threaded fuel cap, no factory door. The Work Truck Fuel Vault bolts over the filler area and locks it shut. Small door.
Fitment Details
- Model Years
- 2015–2026
- Chassis
- GMC 3500HD
- Body Type
- Chassis Cab
- Factory Fuel Cap
- Exposed threaded fuel cap, no factory door
- Recommended Door
- Small Standard
- Typical Doors Needed
- 1
Why This Truck Is a Target
- The factory cap on a GMC 3500HD is fully exposed — no lock, no cover.
- A chassis cab build parks outside overnight where siphoning happens.
- One siphoning event costs $500 to $1,000 in fuel plus lost work hours.
- Contamination — sugar, water, dirt — can destroy an entire fuel system.
No Drilling
Bolts on with existing hardware.
15 Minutes
Basic hand tools, one person.
Made in the USA
Built in Sarasota, Florida.
GMC Sierra 3500HD Chassis Cab — Common Questions
Does the Work Truck Fuel Vault fit a 2015–2026 GMC Sierra 3500HD Chassis Cab?
Yes. The Sierra 3500HD Chassis Cab uses exposed threaded fuel cap, no factory door. The recommended fit is the Small Fuel Vault door. Small door.
How many doors do I need for a GMC Sierra 3500HD Chassis Cab?
One door covers a standard Sierra 3500HD Chassis Cab. If your truck has a separate exposed DEF cap, add a second door.
Do I have to drill anything?
No. The Fuel Vault bolts on using the existing filler area. No drilling, no cutting, no welding. Basic hand tools, about 15 minutes.
Will it interfere with my service body or upfit?
The Fuel Vault mounts to the chassis fuel filler area, not the body. It does not interfere with compartments, shelving, cranes, or racks on a chassis cab build.
What is the warranty?
Limited lifetime warranty on the hardware, plus a 30-day money-back guarantee. Free shipping within the United States.