Description
Duramax 6.6L Fuel Filter Housing — Complete Billet Aluminum Assembly
The iFJF 12642623 Fuel Filter Housing Assembly is a complete, ready-to-install billet aluminum fuel filtration unit engineered for 2005-2013 GM Duramax 6.6L V8 diesel engines (LBZ, LLY, LMM). If your factory plastic housing is cracked, leaking, or the primer pump won't hold pressure, this assembly replaces everything in one bolt-on unit — no piecing together parts or reusing degraded components.
Duramax owners know the OEM fuel filter housing is a known failure point. Heat cycling causes the plastic body to crack and warp, the primer pump diaphragm deteriorates, and the bleeder screw threads strip — leading to air intrusion, hard starts, rough idle, and potential CP3 injection pump damage. This billet aluminum upgrade eliminates every one of those failure modes permanently.
Key Features
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Complete Bolt-On Assembly: Includes filter head, integrated hand primer pump, WIF sensor port, bleeder screw, and mounting hardware — everything pre-assembled and ready to install
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Billet Aluminum Construction: CNC-machined from solid 6061-T6 aluminum with corrosion-resistant anodized finish — will never crack, warp, or degrade like factory plastic
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Direct OEM Replacement: Exact dimensional match for GM part #12642623. Bolts to factory mounting points with no modifications
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Improved Fuel Flow: Optimized internal passages reduce restriction for better fuel delivery under load and towing conditions
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Accepts Standard Filters: Compatible with TP3018, TP3012, and 29531007 fuel/water separator elements
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WIF Sensor Ready: Pre-threaded port accepts your factory water-in-fuel sensor — simply transfer from old housing
Vehicle Compatibility
| Year |
Make |
Model |
Engine |
| 2005-2013 |
Chevrolet |
Silverado 2500HD |
6.6L Duramax V8 (LBZ, LLY, LMM) |
| 2005-2013 |
Chevrolet |
Silverado 3500HD |
6.6L Duramax V8 (LBZ, LLY, LMM) |
| 2005-2013 |
GMC |
Sierra 2500HD |
6.6L Duramax V8 (LBZ, LLY, LMM) |
| 2005-2013 |
GMC |
Sierra 3500HD |
6.6L Duramax V8 (LBZ, LLY, LMM) |
Technical Specifications
| Specification |
Value |
| Replaces OEM |
12642623 |
| Material |
6061-T6 Billet Aluminum (Anodized) |
| Filter Thread |
M36 x 1.5 (standard Duramax spin-on) |
| Inlet/Outlet |
1/2" NPT |
| Fuel Compatibility |
ULSD, B5-B20 Biodiesel |
| WIF Sensor Port |
Pre-threaded — accepts OEM 12639277 sensor |
| Primer Pump |
Integrated hand primer (diaphragm type) |
| SKU |
FJ-TP3018-COMB |
Installation
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Tools Needed: 10mm socket, 13mm wrench, flathead screwdriver, diesel-rated thread sealant
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Time: 30-45 minutes
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Pro Tip: Lube the filter O-ring with clean diesel before threading on. Use the hand primer until firm — 20-30 pumps typically — before starting the engine
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Check: Start engine, let idle 2 minutes, inspect all connections for leaks before closing hood
FAQ
Q: Will this fit my 2008 LMM Duramax?
A: Yes. This housing fits all 2005-2013 Duramax 6.6L engines including LBZ, LLY, LMM variants in Silverado and Sierra 2500HD/3500HD. It also fits 2004.5-2005 LLY. If you have a 2001-2004 LB7, check our 12642623 Head + 1R-0750 Kit.
Q: What are the signs my fuel filter housing needs replacement?
A: Common symptoms: (1) Hard starting after sitting overnight — air is entering the system through a cracked housing or failed primer pump seal; (2) Visible fuel leaks around the housing or bleeder screw; (3) Primer pump won't get firm — diaphragm is torn; (4) "Water in Fuel" light stays on despite draining — sensor port is damaged.
Q: Does this come with a new WIF sensor?
A: The housing includes a pre-threaded sensor port. You can reuse your existing water-in-fuel sensor. If yours is malfunctioning, we recommend replacing it at the same time for a complete refresh.
Q: What's the difference between this and the 12642623 Head + 1R-0750 Kit?
A: This is the standard replacement housing — uses factory-style TP3018 spin-on filters. Our 12642623 + 1R-0750 Kit adds a CAT filter adapter for higher flow rates — ideal for tuned trucks and heavy towing. Choose based on your performance needs.
Q: Is billet aluminum really better than the OEM plastic housing?
A: Absolutely. The OEM plastic housing on Duramax engines is injection-molded nylon that becomes brittle after repeated heat cycles (under-hood temps exceed 200°F). The billet aluminum housing has a coefficient of thermal expansion matched to the engine, won't warp under heat, and the threads won't strip. It's a permanent fix — not a temporary replacement.
Q: Can I install this myself?
A: Yes — it's a straightforward bolt-on job if you're comfortable with basic hand tools. Disconnect the fuel lines (have rags ready — some fuel will spill), remove 3 mounting bolts, transfer the WIF sensor, bolt the new housing on, reconnect lines, prime the system, and start. Most DIYers complete it in under an hour. See our step-by-step rebuild guide for full instructions.
Q: What filter does this use?
A: Standard Duramax spin-on fuel filters — TP3018, ACDelco TP3018, TP3012, or 29531007 elements. We stock the TP3018 fuel filter individually and in a combo pack with the 29539579 transmission filter.
Q: Do I need to replace the seals on my fuel filter head before installing the new housing?
A: This is a brand-new complete housing — all seals are pre-installed. If you're keeping your existing housing and just want to refresh the seals, get our 6-piece rebuild kit instead.
Q: What filter does the 12642623 housing use?
A: This housing accepts standard Duramax spin-on fuel/water separator filters — specifically the TP3018, TP3012, and 29531007 elements. The TP3018 is the most common replacement (1,300+ monthly searches by Duramax owners), offering 4-micron absolute filtration with hydrophobic water separation media. We stock TP3018 filters individually and in combo packs — see our TP3018 fuel filter for details.
Q: Is this compatible with the Duramax fuel filter housing bypass kit?
A: No — this is a direct OEM-replacement housing (12642623 spec). If you're looking for a high-flow conversion that accepts CAT 1R-0750 filters (2-micron absolute, lower cost per filter), see our 12642623 + 1R-0750 kit which includes the CAT filter adapter upgrade.
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