Description
1R-0750 Aluminum Fuel Filter Housing for 2001–2016 Duramax 6.6L Diesel
If you own a Duramax, you've probably heard the horror stories — or lived one. The OEM plastic fuel filter housing cap on 2001–2016 GM trucks is notorious for cracking, warping, and leaking under the heat and pressure of daily driving. When it fails, it doesn't just create a mess — it introduces air into the fuel system, causing hard starts, rough idle, and potential CP3/CP4 injection pump damage. This CNC-machined 6061-T6 billet aluminum refit head eliminates that failure point permanently.
⚠️ Common Symptom Check: Hard start after sitting overnight? Air in the clear fuel line? Fuel smell under the hood? Your plastic factory filter cap may already be failing. This billet aluminum upgrade is a one-and-done fix.
Key Features
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CNC-Machined 6061-T6 Billet Aluminum — Precision-machined from aerospace-grade aluminum bar stock, not cast. Maintains dimensional stability through extreme heat cycles that warp and crack OEM plastic caps.
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Permanent Upgrade Over OEM Plastic — The factory plastic filter head on Duramax engines is a known weak point. Heat cycling causes micro-cracks that grow into air leaks — introducing air into the CP3 high-pressure pump. This aluminum housing eliminates the problem at the source.
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Accepts Standard 1R-0750 / BF7633 Filter Elements — Designed to work with the same OEM-spec secondary fuel filter elements you already use. No special filters required — just swap the cap and use your regular filter.
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Anodized Corrosion Protection — Hard anodized finish resists corrosion from road salt, diesel fuel exposure, and under-hood chemicals. Won't rust, pit, or degrade like untreated aluminum or plastic.
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O-Ring Groove Precision — The sealing surface is machined to exact OEM tolerances for a consistent, leak-free seal with the filter element gasket every single change.
Compatibility
| Year |
Make |
Model |
Engine |
| 2001–2004 |
Chevy / GMC |
Silverado 2500HD/3500HD, Sierra 2500HD/3500HD |
6.6L Duramax LB7 |
| 2004.5–2006 |
Chevy / GMC |
Silverado 2500HD/3500HD, Sierra 2500HD/3500HD |
6.6L Duramax LLY |
| 2006–2007 |
Chevy / GMC |
Silverado 2500HD/3500HD, Sierra 2500HD/3500HD (Classic) |
6.6L Duramax LBZ |
| 2007.5–2010 |
Chevy / GMC |
Silverado 2500HD/3500HD, Sierra 2500HD/3500HD |
6.6L Duramax LMM |
| 2011–2016 |
Chevy / GMC |
Silverado 2500HD/3500HD, Sierra 2500HD/3500HD |
6.6L Duramax LML |
Specifications
| Specification |
Value |
| Material |
6061-T6 Billet Aluminum |
| Finish |
Hard Anodized (Clear or Black) |
| Filter Compatibility |
1R-0750, BF7633, P551313, 3114 secondary filters |
| Manufacturing Process |
CNC Machined (not cast) |
| Thread |
Standard OEM filter thread |
Why Upgrade to Aluminum?
The Duramax secondary fuel filter housing operates in one of the hottest areas of the engine bay — directly above the turbo and exhaust manifold on the passenger side of the engine. The OEM plastic cap undergoes extreme thermal cycling: cold winter mornings, 200°F+ under load, and everything in between. Over 50,000–100,000 miles, this cycling causes the plastic to develop micro-cracks at the thread roots and sealing surfaces. Once air enters the fuel system, the CP3 high-pressure pump loses prime — resulting in hard starts, rough running, and accelerated pump wear. This billet aluminum cap solves the problem with a material that doesn't fatigue, warp, or crack from heat cycling.
Frequently Asked Questions
Q: Will this fit my 2015 Duramax LML?
A: Yes. This housing fits all 2001–2016 Duramax 6.6L engines, including LML (2011–2016). It uses the same 1R-0750 secondary filter element you're already running.
Q: Do I need to replace the whole filter assembly or just the cap?
A: This is a direct replacement for the factory cap/filter head only. You keep your existing filter base/housing on the engine. Installation is: remove old plastic cap, swap the filter element into the new aluminum cap, screw it on. 15 minutes, basic hand tools.
Q: How do I know if my OEM plastic cap is failing?
A: Signs include: hard starting after the truck sits overnight, visible air bubbles in the clear fuel line between the filter and CP3 pump, fuel residue around the filter cap, or the cap feeling unusually loose when tightening. If you see any of these, replace the cap before it strands you.
Q: Does this use the same O-ring as the factory cap?
A: Yes. The O-ring that comes with your standard 1R-0750 or BF7633 filter element works perfectly. No special gaskets or seals required.
Q: Can I use this with a lift pump?
A: Yes. This aluminum housing is fully compatible with aftermarket lift pump systems (FASS, AirDog, etc.). The machined sealing surfaces handle the increased fuel pressure without leaking.
