Knapheide Utility Body Locking Fuel Door
2010–2026 Knapheide Utility Body — dual exposed caps (fuel + def). The Work Truck Fuel Vault bolts over the filler area and locks it shut. Standard fleet configuration.
Fitment Details
- Model Years
- 2010–2026
- Chassis
- Ford F-550, Ram 5500
- Body Type
- Utility Body
- Factory Fuel Cap
- Dual exposed caps (fuel + DEF)
- Recommended Door
- Small Standard
- Typical Doors Needed
- 2
Why This Truck Is a Target
- The factory cap on a Ford F-550, Ram 5500 is fully exposed — no lock, no cover.
- A utility body 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.
Knapheide Utility Body — Common Questions
Does the Work Truck Fuel Vault fit a 2010–2026 Knapheide Utility Body?
Yes. The Utility Body uses dual exposed caps (fuel + def). The recommended fit is the Small Fuel Vault door. Standard fleet configuration.
How many doors do I need for a Knapheide Utility Body?
Most Utility Body builds need 2 doors — one for the diesel fill and one for the DEF cap. Our 2-pack and 3-pack save money versus buying singles.
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 utility body build.
What is the warranty?
Limited lifetime warranty on the hardware, plus a 30-day money-back guarantee. Free shipping within the United States.