Fuel Filters

Q: Are iFJF Duramax filters compatible with OEM housings?

Yes. All iFJF Duramax filters are built to exact OEM dimensions with high-grade synthetic filtration media (5-micron rating). They ensure 98%+ water separation efficiency and require zero modifications during installation.

Q: What causes the Water in Fuel warning on my Duramax?

The Water in Fuel warning indicates water accumulation in the fuel filter housing separator, common on LML and L5P engines. Drain immediately using the bleed screw. Upgrade to an iFJF CNC billet aluminum bleeder screw to prevent stripping and ensure reliable drainage.

Q: What is the difference between TP1015 and TP3018 Duramax fuel filters?

TP1015 is the spin-on fuel filter for 2017+ L5P Duramax engines. TP3018 is the fuel/water separator filter for 2001-2016 LB7 through LML engines. They are not interchangeable.

Q: Do I need to prime the fuel system after changing a Duramax fuel filter?

For L5P models, cycle the key to ON 2-3 times. For LB7-LML, use the manual primer pump until firm resistance. Running without proper priming can cause HPCR system air and injector damage.

Q: How do I know if my Duramax fuel filter housing cap needs replacement?

Signs include fuel seepage, difficulty sealing after filter changes, cracked OE plastic threads, and recurring Water in Fuel warnings. iFJF CNC 6061-T6 billet aluminum caps permanently solve these issues with precision fit.

6.6L Duramax Diesel Performance & Replacement Parts — LB7 LLY LBZ LMM LML L5P Fuel Filters, EGR Delete Kits, Fuel System Components & More

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iFJF TP1015 Fuel Filter and 134001 Silver Housing Cap for Duramax 6.6L 2017-2020 Silverado GMC Sierra 2500HD 3500HD L5P Diesel Engine
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Upgrade Your Duramax L5P Fuel System — TP1015 Filter & 6061-T6 Billet Aluminum Housing Cap Engineered for 2017–2020 Chevy Silverado & GMC Sierra 2500HD/3500HD equipped with the 6.6L L5P Duramax diesel engine, the iFJF TP1015 Fuel Filter & 134001 Housing Cap Combo Kit solves the two biggest pain points of L5P fuel system maintenance: factory plastic cap failures and subpar filtration. One kit. One install. Total peace of mind. 🔧 The Problem with OEM L5P Fuel Filter Caps The factory 134001 plastic housing cap on 2017–2020 Duramax L5P trucks is a known weak point. Overtighten it by even a quarter turn and the plastic cracks — leaving you with a fuel leak, a check engine light, and a $200+ tow to the nearest shop. GM TSB #18-NA-103 documents this exact issue. iFJF replaces that brittle plastic with a CNC-machined 6061-T6 billet aluminum cap — the same aerospace-grade alloy used in performance fuel systems. It won't crack. It won't warp. It won't leave you stranded. 📊 Why iFJF TP1015 vs. OEM Specification iFJF TP1015 OEM (ACDelco) Cap Material 6061-T6 Billet Aluminum Nylon Plastic Filter Micron Rating 5 Micron (Absolute) 7–10 Micron (Nominal) Water Separation 98% Efficiency ~95% Efficiency Filter Media Multi-Layer Synthetic Blend Cellulose Paper O-Ring Included ✅ 2 Premium Viton O-Rings ✅ 1 Standard O-Ring Drain Plug Anodized Aluminum (5 Color Options) Plastic (Non-Serviceable) Price (Filter + Cap) $69.99 $95–$130 (Filter + Cap separately) 🚛 Compatible Vehicles Chevrolet Silverado 2500HD / 3500HD 2017 · 2018 · 2019 · 2020 6.6L L5P Duramax Turbo Diesel V8 GMC Sierra 2500HD / 3500HD 2017 · 2018 · 2019 · 2020 6.6L L5P Duramax Turbo Diesel V8 Also Fits: Chevy Cruze 2.0L Diesel (2014–2015), Chevy Cruze 1.6L Diesel (2017–2019) 🔢 Cross-Reference / Replaces OEM Part Numbers Fuel Filter: TP1015 · 22937279 · 23456595 · 23304096 · ACDelco TP1015 Housing Cap: 134001 · ACDelco 134001 ⚙️ Technical Specifications Filter Media: Multi-layer synthetic blend with pleated cellulose core — superior dirt-holding capacity vs. OEM paper Filtration Rating: 5 micron absolute — captures 99.9% of particles ≥5μm (OEM paper elements typically rate 7–10μm nominal) Water Separation: Hydrophobic barrier layer achieves 98% water removal efficiency, protecting CP4.2 high-pressure fuel pump from water-induced cavitation damage Cap Material: CNC billet 6061-T6 aluminum with black anodized finish on Silver variant Cap Design: 32mm hex head for standard socket wrench — no special tools needed Drain Plug: Integrated anodized aluminum drain valve for easy water drainage during service intervals O-Rings: 2 premium Viton® fluoroelastomer O-rings (cap seal + filter seal) — rated to 400°F, diesel-resistant Service Interval: Replace every 15,000–22,500 miles (24,000–36,000 km) or per GM maintenance schedule Torque Spec: 25 ± 3 N·m (18 ± 2 ft-lbs) — no risk of cracking vs. plastic cap 🎨 Available Finishes — 5 Anodized Colors Choose the cap color that matches your build: 🔴 Red — Aggressive, race-inspired look 🟡 Gold — Premium, standout finish 🟢 Green — Subtle OEM+ appearance ⚪ Silver — Classic machined aluminum with black trim ⚫ Black — Stealth, factory-look finish 📦 What's in the Box 1 × TP1015 Fuel Filter (multi-layer synthetic blend media, 5μm) 1 × 134001 Housing Cap (CNC 6061-T6 billet aluminum) 1 × Anodized aluminum drain plug (pre-installed) 2 × Viton® O-rings (large cap seal + small filter seal) 1 × Installation instruction card 🛠️ Installation Tips PRIME THE FILTER: Fill the new filter with clean diesel before installing — this prevents the CP4.2 pump from running dry on first start. LUBE THE O-RINGS: Apply a thin film of clean diesel or silicone grease to both O-rings before installation. TORQUE TO SPEC: Hand-tighten, then torque to 18 ft-lbs (25 N·m). Threads engage smoothly — if you feel resistance, back off and realign. BLEED THE SYSTEM: After installation, cycle the key to "ON" (without starting) 3–5 times to prime the fuel system. The CP4.2 is self-priming — you'll hear the in-tank pump cycle. CHECK FOR LEAKS: Start the engine and inspect the cap area. No drips = good to go. ❓ FAQ Q: Will this fit my 2021+ L5P Duramax? A: No. GM changed the fuel filter housing design for 2021+ model years. This kit is specifically for 2017–2020 L5P trucks. For 2021+, use our updated L5P 2021+ filter kit. Q: How often should I replace the fuel filter? A: GM recommends every 22,500 miles under normal conditions. If you tow heavy, idle frequently, or run biodiesel blends, replace every 15,000 miles. Q: Can I reuse the aluminum cap with future filter changes? A: Yes! The 6061-T6 cap is a lifetime upgrade. Only the filter element and O-rings need replacement at each service interval. We sell replacement filter-only kits. Q: Does this void my warranty? A: No. Under the Magnuson-Moss Warranty Act, using aftermarket parts does not automatically void your warranty. The TP1015 meets or exceeds all OEM filtration specs. ⚠️ IMPORTANT: Always prime the fuel filter with clean diesel before installation. A dry-start CP4.2 high-pressure pump can cause catastrophic failure — a $4,000+ repair you don't want. 🔗 L5P Duramax Resources 📖 Installation Guide: L5P Fuel Filter Housing Cap Replacement — Complete DIY Guide (2017–2020) — step-by-step, torque specs, CP4.2 protection. 🛒 134001 Billet Aluminum Fuel Filter Housing Cap (Silver) — CNC 6061-T6, lifetime upgrade, standalone cap 🛒 TP1015 Replacement Fuel Filter Element — 5-micron absolute, 98% water separation, $19.99 🛒 A3231C Air Filter for L5P Duramax — high-flow replacement for 2017–2019 Silverado/Sierra 2500HD 3500HD 🛒 TP1015 Fuel Filter + A3231C Air Filter Combo — save on both filters for your L5P 🔍 Shop All Duramax 6.6L Parts → 🔍 Browse All Fuel Filters →

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Diesel Fuel Filters for Trucks, RVs & Marine Engines

Keep your diesel engine running clean with premium fuel filters from iFJF Direct. We stock a complete range of fuel filter assemblies, water separators, and replacement elements for the most popular diesel platforms in North America.

What We Carry

Fuel Filter Assemblies — Complete housing + filter combos for Duramax, Cummins, and Powerstroke engines
Fuel Water Separators — R12T, S3213, and marine-grade separators with clear bowls
Replacement Filter Elements — Drop-in cartridges for OEM filter housings (Racor, WIX, NAPA cross-reference)
Filter Caps & Housing Parts — L5P aluminum upgrade caps, return line connectors, bleeder screws
Marine Fuel Filters — Outboard motor filters compatible with Mercury, Yamaha, and Sierra systems

Popular Applications

Why iFJF Fuel Filters?

Every filter is manufactured to meet or exceed OEM specifications. 10-micron filtration media captures 99% of contaminants. US-based stock ensures fast shipping. Cross-reference our filters with WIX, NAPA, Baldwin, and Fleetguard part numbers in the product descriptions.

OEM-Grade Duramax Replacement Parts & Maintenance Filters

iFJF Direct offers precision-engineered aftermarket replacement filters and components tailored for GM Chevy/GMC Duramax diesel engines. Designed to match or exceed OEM specifications, our products provide optimal filtration efficiency and engine longevity for Silverado and Sierra 2500HD/3500HD trucks. Every component is manufactured to strict quality standards with a 45-day return policy and fast shipping from Boulder, Colorado.

Duramax Engine Generation Compatibility Guide

LB7 (2001–2004): Fuel water separators, oil filtration kits, and air bleeder screws for the original 6.6L Duramax.
LLY / LBZ / LMM (2004.5–2010): Precision oil filters, CCV elements, fuel filter housings, and EGR maintenance components.
LML (2011–2016): Advanced fuel filter kits designed for high-pressure common rail (HPCR) systems — spin-on and cartridge options.
L5P (2017–2026): Next-gen oil filter housing caps, dual fuel filter service kits, TP1015/134001 replacements with CNC billet aluminum upgrades.
LM2 / LZ0 (2020+ 3.0L inline-6): Specialized maintenance kits for light-duty Duramax diesel applications.

Duramax OEM Cross-Reference & Replacement Guide

Use this table to quickly find the iFJF replacement part that matches your original equipment. All parts listed are direct fit, no modifications required.

OE / OEM Part No.	Engine Generation	Part Type	Replaces / Cross-Reference
TP1015 / 134001	L5P (2017-2026)	Fuel Filter Kit + Housing Cap	ACDelco TP1015, GM 13539108, OE 134001
TP3018	LB7-LLY-LBZ-LMM-LML (2001-2016)	Fuel/Water Separator Filter	ACDelco TP3018, GM 12664429, Racor PFF50216
FJ-TOOL09	All 6.6L Duramax (2001-2026)	Billet Air Bleeder Screw	GM 12642623 Bleeder Screw Upgrade
12642623	L5P (2017-2026)	Fuel Filter Housing Assembly	GM 12642623, ACDelco TP1015 Housing
122-0836	Onan QG RV Generators	Oil Filter	Onan 122-0836, Cummins Onan HGJAA/HGJAB

Duramax Maintenance FAQ

How often should I change the fuel filter on a 6.6L Duramax?

GM recommends replacing the Duramax fuel filter every 15,000 to 22,500 miles, or every 12 months. If operating under heavy towing conditions or using biodiesel blends, changing it every 10,000 miles is recommended to protect the high-pressure fuel pump (CP4/HPCR). The L5P models (2017+) use a dual-filter system — both filters should be changed simultaneously for optimal protection.

Are iFJF Duramax filters compatible with OEM housings?

Yes. All iFJF Duramax oil, fuel, and CCV filters are built to exact OEM dimensions. They feature high-grade synthetic filtration media (5-micron rating on fuel filters) to ensure 98%+ water separation efficiency and zero modifications required during installation. Compatible with ACDelco, Racor, and GM factory filter housings.

What causes the "Water in Fuel" warning on my Duramax?

The "Water in Fuel" warning light indicates water accumulation in the fuel filter housing separator. This is common on LML and L5P engines. Drain the water separator immediately using the bleed screw, and consider replacing the filter if the warning persists. Upgrading to an iFJF CNC billet aluminum bleeder screw (replacing the fragile OE plastic screw) prevents stripping and ensures reliable drainage.

Do I need to prime the fuel system after changing a Duramax fuel filter?

For L5P (2017+) models with the electric lift pump, the system self-primes after filter replacement — simply cycle the key to "ON" (without starting) for 30 seconds, repeat 2-3 times. For LB7-LML models, use the manual primer pump on the filter housing until firm resistance is felt. Running the engine without proper priming can cause air in the HPCR system and potential injector damage.

What is the difference between TP1015 and TP3018 Duramax fuel filters?

TP1015 is the spin-on fuel filter used on 2017+ L5P Duramax engines (driver-side frame rail mount). TP3018 is the fuel/water separator filter for 2001-2016 LB7 through LML engines. They are not interchangeable — verify your model year before ordering. iFJF offers both types, including complete kits with upgraded CNC aluminum housing caps.

How do I know if my Duramax fuel filter housing cap needs replacement?

Common signs include: fuel seepage around the cap, difficulty achieving a proper seal after filter changes, cracked or stripped threads on the OE plastic cap, and recurring "Water in Fuel" warnings despite draining. iFJF upgraded CNC 6061-T6 billet aluminum caps (available in multiple colors for the L5P 134001 housing) permanently solve these issues with a precision-machined fit and O-ring sealing surface that outlasts the factory plastic components.