DooFig Fuel Filler Housing for GMC Sierra 2500/3500 HD 6.6 ft Bed — OEM-Fit Direct Replacement

DooFig Fuel Door Tank Filler Pipe Housing replaces the factory fuel filler housing on GMC Sierra 2500/3500 HD gas models with a 6'6" (6.6 ft) bed for model years 2020–2026, restoring proper fit and alignment.

This replacement fuel filler door housing is engineered to match the OE mounting points and contours of GMC Sierra 2500 HD (2020–2026) and Sierra 3500 HD (2020–2025) gas models equipped with the 6'6" (6.6 ft) box bed. It is an exact-fit aftermarket component offered by DooFig intended to replace broken, corroded, or missing fuel door housings. The part is listed as compatible with factory part numbers 84749789 and 84673134, and each package contains one housing ready for installation.

Will this housing fit my GMC Sierra model year and bed size?

Yes — this housing is specified for gas-engine GMC Sierra 2500 HD from 2020 through 2026 and GMC Sierra 3500 HD from 2020 through 2025, but only for trucks with the 6'6" (6.6 ft) box bed. It is not compatible with diesel variants or other bed lengths. Verify your truck's engine type and bed length before ordering to ensure compatibility.

• Compatible: Sierra 2500 HD 2020–2026 (gas models)
• Compatible: Sierra 3500 HD 2020–2025 (gas models)
• Required: 6'6" (6.6 ft) gas box bed only
• Not compatible with diesel engines or other bed sizes

How does this replacement match OEM specifications?

DooFig designed the housing to align with original mounting points and external contours so it installs like the factory unit. It is intended as a direct replacement for part numbers 84749789 and 84673134, allowing you to reuse existing fasteners and seals where applicable. The goal is a snug, secure fit that restores appearance and functionality.

• Engineered to match OEM mounting points and shape
• Listed as replacement for 84749789 and 84673134
• Fits with factory fasteners and surrounding trim where applicable
• Designed for straightforward swap-in installation

What should I expect during installation?

Installation typically involves removing the damaged housing and attaching the DooFig housing in its place; it is designed for bolt-on replacement and to interface with existing hardware. Depending on truck condition you may need basic hand tools and possibly a trim panel tool to access mounting points. If the original fuel door components were damaged, inspect nearby trim and seals and replace them as needed to maintain proper sealing.

• Remove old housing and retain usable mounting screws
• Align housing to factory holes and secure with bolts
• Check fit of fuel door and surrounding trim for correct alignment
• Recommended: basic hand tools and a trim removal tool

Will this housing affect fuel filler access or safety features?

The DooFig housing serves as the structural mounting for the fuel filler door and is designed to preserve normal access to the filler neck and door operation. It does not alter fuel system components or emissions controls; it simply replaces the external housing component. Always confirm all fasteners are tight and that the door opens and closes freely after installation.

• Maintains standard fuel door access and movement
• Does not modify fuel system or emissions equipment
• Ensure proper fastening for secure operation
• Inspect for smooth door alignment after installation

Who is this for: This DooFig replacement fuel filler door housing is intended for GMC Sierra 2500/3500 HD owners with gas engines and a 6'6" bed who need a direct-fit housing to replace a damaged or missing factory piece. It suits DIY mechanics, body shops, and fleet maintenance professionals who want a compatible aftermarket option for part numbers 84749789 and 84673134. If you drive a diesel Sierra or have a different bed length, check fitment before purchasing.