iFJF Fuel Filter Housing Cap Replacement for Duramax 6.6L L5P (2017–2020) — CNC 6061‑T6 Aluminum with Stainless Drain Screw

The iFJF 134001 fuel filter housing cap is a CNC-machined 6061-T6 aluminum replacement designed to fit GM Duramax 6.6L L5P engines and select Chevrolet Cruze models, offering a stronger, longer-lasting alternative to the factory cap.

This replacement cap is precision-engineered to match the fit and function of the original housing cap used on 2017–2020 Duramax 6.6L L5P trucks and certain Cruze engines, while improving durability and corrosion resistance. Instead of the softer stock material, iFJF uses billet aluminum plus an upgraded stainless steel drain screw, making routine service and drain operations more reliable. The package contains the cap and a stainless drain plug but does not include the O-ring gasket.

Will this cap fit my vehicle?

Compatibility covers GM Duramax 6.6L L5P trucks from model years 2017 through 2020 and specific Chevrolet Cruze engines (2014–2015 2.0L and 2017–2019 1.6L). It is manufactured to replace part number 134001 and to install in the same housing location as the OEM cap.

• Direct replacement for part number 134001
• Fitment: Duramax 6.6L L5P (2017–2020)
• Also compatible with Cruze 2.0L (2014–2015) and Cruze 1.6L (2017–2019)
• Engineered to align with factory mounting points and sealing surfaces

How is this cap stronger than the original?

Instead of the common stamped or cast materials, this cap is made from CNC-machined 6061-T6 billet aluminum, delivering greater tensile strength and resistance to cracking during installation or removal. The construction reduces the risk of damage from over-tightening and holds up better to repeated service cycles.

• 6061-T6 billet aluminum construction for improved durability
• Precision machining for consistent dimensions and fit
• Less prone to cracking compared with softer OEM caps
• Tested individually to ensure accurate fitment

What does the upgraded drain plug do for me?

The iFJF cap includes a stainless steel drain screw instead of the typical aluminum plug, which significantly reduces the chance of corrosion and thread wear. That makes draining fuel for filter changes easier and more dependable, and the screw is covered by a lifetime warranty offered with the accessory.

• Stainless steel drain plug resists corrosion and galling
• Improves longevity compared with aluminum plugs
• Facilitates reliable fuel draining during service
• Drain plug accessory backed by a lifetime warranty

What should I know about installation and contents?

The cap is sold with the drain screw but does not include the rubber O-ring seal, so plan to reuse your existing O-ring if it is serviceable, or purchase a replacement seal separately for a leak-free installation. Because the cap is CNC-machined to OEM dimensions, it installs like the factory part but requires proper torque and an intact sealing surface.

• Package includes: 1 fuel filter housing cap and 1 stainless drain plug
• O-ring is not included — replace if worn or cracked
• Install using the factory torque specs and a clean sealing surface
• Each cap is inspected to ensure correct fitment before shipping

Who is this for: The iFJF 134001 fuel filter housing cap is ideal for truck owners, fleets, and home mechanics who service Duramax-powered Chevrolet or GMC trucks and want a more robust replacement than the original. It suits anyone replacing a damaged OEM cap, upgrading weak drain hardware, or seeking a long-lasting component that stands up to repeated filter changes. If you expect heavy use, harsh environments, or simply prefer stronger service parts, this cap is a practical, direct-fit option—remember to source a compatible O-ring if yours needs replacing.