WnSEu Billet Fuel Filter Housing Cap for 2017-2019 Chevy/GMC 6.6L L5P — Black Anodized CNC Aluminium

WnSEu's billet aluminum fuel filter housing cap replaces the original cap on 2017–2019 Chevy and GMC 6.6L L5P Duramax trucks to provide a durable, anodized black alternative that installs directly in place of the OE part.

This replacement cap is engineered to match the OE form and fit for 2017–2019 Chevy/GMC 6.6L L5P Duramax (2500HD/3500HD) applications. Machined from high-quality aluminum alloy and finished with a black anodized surface, it offers a corrosion-resistant option intended for straightforward swap-in installation. The part is sized for vehicles without the TP1015 secondary fuel filter and is offered as an exact-replacement style upgrade for maintenance or cosmetic refreshes.

Will this cap fit my 2017–2019 Chevy or GMC 6.6L L5P Duramax?

The cap is designed specifically for 2017–2019 model-year 6.6L L5P Duramax engines on Chevy and GMC 2500HD/3500HD trucks that use the OE fuel filter housing and do not have the TP1015 secondary fuel filter option. Verify your vehicle’s year, engine code, and filter setup before purchase to ensure compatibility.

• Fits 2017–2019 Chevy/GMC 6.6L L5P Duramax 2500HD and 3500HD
• Compatible with original style fuel filter housings (no TP1015 secondary filter)
• Direct-replacement dimensions matching OE interface for a snug fit

How is this WnSEu cap built and finished?

This cap is CNC-machined from aluminum alloy for strength while keeping weight low. The surface receives a black anodized finish to resist oxidation and wear, giving a long-lasting appearance that’s easier to keep clean than untreated metal.

• High-quality aluminum alloy construction for rigidity and light weight
• Black anodized surface for corrosion resistance and visual consistency
• Precision machining to match OE sealing surfaces and threads

What should I know about installation and maintenance?

Installation is intended to be a direct replacement of the OEM cap, using the existing housing and seals whenever they remain serviceable. Basic hand tools are typically sufficient for removal and reinstallation; inspect the sealing O-ring and replace if worn to maintain leak-free performance.

• Direct swap with OE cap—no housing modification required
• Check and replace O-ring or gasket during install for best sealing
• Clean mating surfaces before tightening to ensure a proper seal

Are there any fitment or compatibility details to double-check?

Confirm that your truck does not have the TP1015 secondary fuel filter option and that the original fuel filter housing is the OE-style unit. If your truck has been modified or uses an aftermarket housing, compare mounting points and thread patterns before ordering.

• Not for trucks equipped with TP1015 secondary fuel filter assemblies
• Compare thread pattern and sealing surface if aftermarket parts are already installed
• Keep original mounting hardware if it is in good condition; replace if damaged

Who is this for: This WnSEu billet fuel filter housing cap is aimed at Duramax owners who need an OE-fit replacement or a durable aesthetic upgrade for their 2017–2019 Chevy or GMC 6.6L L5P truck without the TP1015 filter. It's suitable for mechanics, fleet technicians, and do-it-yourself truck owners who prioritize correct fitment, corrosion resistance, and an improved surface finish over the stock cap.