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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.
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