Sale Price: $84.99
Clearance Price: $67.99
All sales are final for clearance items. We do our best to show in the pictures any blemishes, scratches or dents, all blemishes are purely aesthetic and do not affects the performance or reliability of the part. Due to inventory variances, pictures may not reflect the actual blemishes and should be referred to as examples.
Sinister Diesel Billet Fuel Cap – 1999–2007 & 2020–2023 Powerstroke
Fits Ford F-250 / F-350 / F-450 Pickup Models
Fitment Notes
• This fuel cap is intended for pickup trucks only. Ford Excursion and Cab & Chassis models may use different filler neck designs—fitment must be verified before ordering.
• Important 1999 model note: Some 1999 trucks use a snap-in style fuel cap. This fuel cap is designed for trucks with a threaded fuel filler neck only. Please verify your truck uses a threaded cap before purchasing.
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 appearance
• Anodized in Sinister Blue for corrosion resistance and long-term finish
• Laser-etched Sinister Diesel logo for a clean, finished look
• O-ring seal helps keep dirt and moisture out of the fuel system
• Integrated magnet allows the cap to be securely held while fueling
• Simple drop-in installation on threaded pickup filler necks
• Backed by a 2 year warranty
Product Overview
The Sinister Diesel Billet Fuel Cap is a premium replacement for the factory fuel cap used on select 1999–2007 and 2020–2023 Powerstroke pickup trucks. Over time, the factory plastic fuel caps can crack, loosen, or fail altogether—allowing dirt, moisture, and debris to enter the filler neck.
This Sinister Diesel fuel cap is designed to replace those worn factory units while maintaining proper sealing and fitment. The internal sealing components follow the factory-style design to ensure reliable operation, while the exposed outer cap is upgraded to CNC-machined billet aluminum for added strength and a refined appearance.
Finished in Sinister Blue anodizing and laser-etched with the Sinister Diesel logo, this fuel cap delivers a subtle but functional upgrade every time you fuel up—restoring confidence, fitment, and visual appeal without changing how your fuel system operates.
What’s Included
• (1) Sinister Diesel Billet Fuel Cap
• (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 cap. This fuel cap only fits trucks with a threaded filler neck. Please verify your fuel cap style before ordering.
Q: Does this fit Excursion or Cab & Chassis trucks?
A: Fitment can vary on those models 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 follow a factory-style design to ensure proper fit and function.
Q: What problem does this solve compared to the stock fuel cap?
A: Factory plastic fuel caps are prone to cracking, loosening, or breaking 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.
