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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.
The Sinister Diesel Billet Fuel Cap in Sinister Green 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 impact.
Finished in Sinister Green anodizing and laser-etched with the Sinister Diesel logo, this cap adds a subtle but high-quality detail every time you fuel up—restoring confidence, fitment, and style without changing how your fuel system operates.
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