Ford F-550 Chassis Cab Locking Fuel Door
2017–2026 Ford F-550 Chassis Cab — dual exposed caps (fuel + def). The Work Truck Fuel Vault bolts over the filler area and locks it shut. Most common work truck fit. Add a second door for the DEF cap.
Fitment Details
- Model Years
- 2017–2026
- Chassis
- Ford F-550
- Body Type
- Chassis Cab
- 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 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.
Ford F-550 Chassis Cab — Common Questions
Does the Work Truck Fuel Vault fit a 2017–2026 Ford F-550 Chassis Cab?
Yes. The F-550 Chassis Cab uses dual exposed caps (fuel + def). The recommended fit is the Small Fuel Vault door. Most common work truck fit. Add a second door for the DEF cap.
How many doors do I need for a Ford F-550 Chassis Cab?
Most F-550 Chassis Cab 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 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.