Sinister Diesel Billet Fuel Cap – Sinister Gray
Fits 1999–2007 & 2020–2023 Powerstroke F-250, F-350, F-450 Pickup Trucks
Fitment Notes
• This fuel cap is designed for pickup truck fuel filler necks only. Ford Excursion and Cab & Chassis models may use different filler neck styles and should verify fitment before ordering.
• Important 1999 model note: Some 1999 Powerstroke trucks use a snap-in fuel cap. This cap is designed only for threaded fuel filler necks. Please confirm your truck uses a threaded cap prior to purchase.
Key Features
• Direct replacement for worn, cracked, or missing factory fuel caps on pickup trucks
• Retains factory-style internal sealing design for proper fit and function
• CNC-machined billet aluminum outer cap for improved durability and premium feel
• Anodized in Sinister Gray for corrosion resistance and a clean, understated finish
• Laser-etched Sinister Diesel logo for a refined, finished appearance
• O-ring seal helps keep dirt and moisture out of the fuel filler neck
• Integrated magnet allows the cap to be securely held while fueling
• Simple drop-in installation on threaded pickup fuel filler necks
• Backed by a 2 year warranty
Product Overview
The Sinister Diesel Billet Fuel Cap in Sinister Gray is a premium upgrade and direct replacement for the factory fuel cap used on select 1999–2007 and 2020–2023 Powerstroke pickup trucks. Factory plastic fuel caps are known to crack, loosen, or fail over time, allowing dirt and moisture into the filler neck and detracting from the overall appearance of your truck.
This fuel cap replaces the worn factory unit while maintaining proper sealing and function. The internal components follow the factory-style design to ensure correct operation, while the exterior is upgraded with a CNC-machined billet aluminum cover for added durability and visual refinement.
Finished in Sinister Gray anodizing and laser-etched with the Sinister Diesel logo, this cap delivers a subtle, OEM-plus look that complements any build—restoring confidence, fitment, and style without changing how your fuel system operates.
What’s Included
• (1) Sinister Diesel Billet Fuel Cap – Sinister Gray
• (1) Viton O-ring
Frequently Asked Questions
Q: Will this fit my 1999 Powerstroke?
A: Some 1999 trucks use a snap-in fuel cap, while others use a threaded style. This fuel cap only fits trucks with a threaded filler neck. Please verify your cap style before ordering.
Q: Does this fit Excursion or Cab & Chassis models?
A: Fitment can vary due to different filler neck designs. This fuel cap is intended for pickup trucks, and Excursion or Cab & Chassis owners should verify fitment prior to purchase.
Q: Is this a fully billet fuel cap?
A: The outer cap is CNC-machined billet aluminum, while the internal sealing components retain a factory-style design for proper fit and function.
Q: What problem does this solve compared to the stock fuel cap?
A: Factory plastic fuel caps commonly crack or break over time. This replacement restores proper sealing while upgrading the exposed portion to billet aluminum for durability and appearance.
Q: Does this affect fueling or emissions systems?
A: No. This fuel cap functions the same as the factory unit and does not alter fueling, venting, or emissions operation.
