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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.
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