iFJF Fuel Filter Housing Cap Replacement for Duramax 6.6L L5P – Green CNC 6061‑T6 Aluminium with Stainless Drain Plug

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

If your Duramax 6.6L L5P or compatible Chevy/GMC/Cruze has a cracked or worn fuel filter housing cap, this iFJF replacement is made to restore secure sealing and convenient draining. Machined from billet aluminum and finished in green, the cap replaces part number 134001 and ships with a stainless steel drain plug to resist corrosion. It’s intended as a durable, direct-fit option for older or damaged caps while matching factory fit and function.

Will this cap fit my 2017–2020 Duramax 6.6L L5P?

Yes — the iFJF 134001 cap is engineered to replace the factory fuel filter housing cap on GM Duramax 6.6L L5P trucks from 2017 through 2020. It follows the same mounting and sealing dimensions so installation does not require housing modifications.

• Direct replacement for OEM part number 134001.
• Compatible with Chevy Silverado/GMC Sierra 2500HD and 3500HD (2017–2020).
• Also fits select Cruze models noted in compatibility list.

How is this iFJF cap more durable than the original?

The cap is CNC-machined from 6061-T6 billet aluminum, which is much stronger and less prone to cracking than the factory plastic cap. The included stainless steel drain plug further reduces corrosion risk, extending service life in wet or salty environments.

• 6061-T6 aluminum body resists deformation and cracking.
• Stainless steel drain plug resists rust, backed by a lifetime warranty on the screw accessory.
• Precision machining ensures consistent fit and repeatable sealing.

What comes in the package and what should I expect during installation?

Inside the box you’ll find one iFJF fuel filter housing cap (O-ring not included) and one stainless steel drain plug. The cap installs where the factory cap sits; use the original O-ring and torque settings for a secure seal. No additional adapters are required for correct fitment.

• Package contents: 1 cap, 1 stainless drain plug (O-ring not included).
• Installation uses the factory mounting points and O-ring; follow OEM torque specs.
• Precision-tested for fit to minimize leaks and simplify replacement.

Why choose this aftermarket cap over replacing OEM parts repeatedly?

Because it’s built from metal and designed to resist the common failure modes of plastic caps — cracking under torque or age — the iFJF cap reduces the chance of repeat replacements. The durable materials and corrosion-resistant drain plug help avoid downtime and maintenance costs associated with frequent failures.

• Stronger construction lowers risk of damage during removal and reinstallation.
• Corrosion-resistant drain plug prevents rust-related failures.
• Precision fit preserves factory performance and simplifies servicing.

Who is this for: The iFJF 134001 fuel filter housing cap replacement is aimed at Duramax owners, fleet managers, and home mechanics seeking a robust, long-life upgrade to the stock fuel filter cap. It’s especially useful if you’ve experienced cracked plastic caps, need a corrosion-resistant drain solution, or want a professionally machined replacement that installs without modification. Verify vehicle compatibility with your model year and engine before ordering.