134001 FUEL FILTER HOUSING CAP FOR 6.6L DURAMAX L5P 2017-2023 | IFJF

iFJF part No.: FJ-CAP07-SI. CNC Billet Aluminum Fuel Filter Cap for 2017-2023 Duramax L5P Replaces OEM 134001 The L5P Duramax is the most powerful diesel GM has ever put in a heavy-duty truck, pushing 445 horsepower and 910 lb-ft of torque. But its factory fuel filter cap a plastic component subjected to heat cycles, vibration, and repeated filter changes remains a weak link. Cracked caps cause fuel leaks, stripped threads mean you can't properly seal the filter housing, and a failed cap on the road can leave you stranded. This billet aluminum fuel filter cap is CNC-machined from solid 6061-T6 aluminum for a lifetime of filter changes without deformation, stripping, or cracking. Key Features 6061-T6 Billet Aluminum: Precision CNC-machined from a solid block of aerospace-grade aluminum, not cast, not molded this cap maintains dimensional accuracy through extreme temperature cycling and years of filter changes. Anodized Finish: Hard-coat anodized surface resists corrosion from road salt, diesel fuel exposure, and under-hood chemicals it won't pit, oxidize, or degrade like raw aluminum. Stripped-Thread Insurance: The factory plastic cap threads are notorious for cross-threading and stripping, especially during roadside filter changes. Precision-cut aluminum threads engage smoothly and stay true for the life of the cap. OEM Fitment: Designed as a direct replacement for GM part number 134001, the L5P's factory fuel filter cap. Same dimensions, same O-ring seal interface, zero modifications required. Hex-Drive Center: The machined hex recess accepts a standard socket or wrench for positive removal torque no more struggling with a filter strap wrench in the tight engine bay. Stainless Steel Drain Screw: The top-mounted drain/vent screw is machined from stainless steel with an integrated sealing washer a direct upgrade over the factory plastic screw that seizes, rounds out, or leaks after repeated water-drain and air-purge cycles. Vehicle Compatibility Make Model Years Engine Chevrolet Silverado 2500HD 2017-2023 6.6L Duramax L5P Turbo Diesel Chevrolet Silverado 3500HD 2017-2023 6.6L Duramax L5P Turbo Diesel GMC Sierra 2500HD 2017-2023 6.6L Duramax L5P Turbo Diesel GMC Sierra 3500HD 2017-2023 6.6L Duramax L5P Turbo Diesel Technical Specifications Specification Value Part Type Fuel Filter Housing Cap Material 6061-T6 Billet Aluminum Manufacturing Process CNC Machined (Not Cast or Molded) Finish Hard-Coat Anodized (Corrosion Resistant) Replaces OEM 134001 (GM/ACDelco) Thread Type Precision-Cut Aluminum, OEM Profile Drive Style Machined Hex Recess (Socket-Compatible) Application Under-Hood Fuel Filter Housing (Engine-Mounted) Weight Approximately 0.45 lbs (Significantly Heavier than Plastic OEM) Why Replace Your Plastic Factory Cap? The OEM plastic fuel filter cap on the L5P is adequate when new, but repeated heat cycling (from -20 F winter starts to 220 F+ under-hood temps during heavy towing) causes the nylon material to degrade. The threads gradually lose their crisp profile, making each filter change harder than the last. Eventually, the cap either won't tighten to a proper seal (causing a fuel leak and loss of prime) or the drive recess rounds out, trapping a stuck cap on the housing. This billet aluminum replacement eliminates all three failure modes. It's a one-time upgrade that pays for itself the first time you avoid a roadside filter change nightmare. Installation & Maintenance This cap is a direct swap remove the factory plastic cap, tra