Description
Duramax Fuel Filter Head Rebuild Kit — Stop Leaks & Hard Starts
The iFJF Duramax Fuel Filter Head Rebuild Kit fixes the most common fuel system issues on 2001-2013 GM Duramax 6.6L diesel trucks (LB7, LLY, LBZ, LMM) — fuel leaks, air intrusion, and a primer pump that won't hold pressure. This 6-piece Viton seal kit replaces every wearable seal and O-ring in your filter head, plus includes a CNC-machined billet aluminum bleeder screw to replace the notoriously failure-prone OEM plastic screw. Save $200+ compared to replacing the entire filter housing at the dealer.
Over time, the rubber seals in the Duramax filter head harden, shrink, and crack from heat cycling and diesel exposure. When seals fail, air enters the fuel system — causing extended cranking on cold starts, rough idle, and stalling under load. The OEM plastic bleeder screw is another known weak point: the hex head rounds off and the threads strip after just a few filter changes. This kit solves both problems in one affordable package.
What's Included
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6 Viton O-Rings & Seals: Primer pump diaphragm seal, filter head base gasket, heater element O-ring, WIF sensor O-ring, bleeder screw O-ring, and fuel line fitting seal — all Viton for superior diesel and heat resistance
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CNC Billet Aluminum Bleeder Screw (Black): Replaces the OEM plastic bleeder screw (GM 97363195). Machined from solid 6061-T6 aluminum — will never strip, crack, or round off
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Installation Guide: Step-by-step instructions with torque specs for each seal
Key Features
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Viton Material: Unlike generic rubber O-rings that degrade in diesel within months, Viton (FKM) seals resist diesel fuel, biodiesel, engine heat (rated to 400°F), and compression set — maintaining a leak-free seal for years
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Complete Kit: Every seal you need — no running to the parts store mid-job for that one O-ring you forgot
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Billet Bleeder Screw: Same 6061-T6 aluminum construction as our standalone billet bleeder screw — solves the stripped-thread problem permanently
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Dealer Alternative: GM dealers typically replace the entire filter housing ($300+) instead of rebuilding it. This $23.99 kit fixes the actual problem.
Compatibility
| Year |
Make |
Model |
Engine |
| 2001-2013 |
Chevrolet |
Silverado 2500HD / 3500HD |
6.6L Duramax (LB7, LLY, LBZ, LMM) |
| 2001-2013 |
GMC |
Sierra 2500HD / 3500HD |
6.6L Duramax (LB7, LLY, LBZ, LMM) |
When to Rebuild Your Filter Head
- Primer pump never gets firm — stays soft even after 20+ pumps
- Hard starting after truck sits overnight (air in fuel system)
- Visible diesel residue around the filter head or bleeder screw
- "Water in Fuel" light flickers intermittently (sensor O-ring leak)
- Fuel drips from the bottom of the housing after filter change
FAQ
Q: Is this a difficult DIY job?
A: Moderate difficulty — expect 1-2 hours. You'll need basic hand tools (10mm socket, pick set for old O-rings, torque wrench). The filter head stays on the engine — you're just replacing seals. Our step-by-step rebuild guide walks you through every step.
Q: Will this fix my hard start problem?
A: If your hard starts are caused by air intrusion through worn seals — very likely. After the truck sits, air replaces fuel in the filter head. When you crank, the injection pump has to push that air pocket through before fuel reaches the injectors. New seals prevent air from entering. If hard starts persist after rebuild, check the fuel pressure regulator and injection pump.
Q: What's the difference between this and buying a whole new housing?
A: A new fuel filter housing assembly ($97.99) replaces everything — housing, primer pump, and all seals. This rebuild kit ($23.99) replaces the seals and bleeder screw only — ideal if your housing body is physically intact but the seals are leaking. If your housing is cracked or the primer pump lever is broken, get the full housing.
Q: Are these seals diesel-proof?
A: Yes — Viton (FKM) is the gold standard for diesel fuel systems. Unlike standard nitrile (Buna-N) O-rings that swell and degrade in diesel, Viton maintains its shape and elasticity at temperatures up to 400°F. These are the same material used in OEM Cummins and Duramax fuel system seals.
Q: Can I install the billet bleeder screw separately?
A: Yes — if you only need the bleeder screw, get our standalone billet aluminum bleeder screw (available in red, black, and silver).
Q: What torque should I use on the bleeder screw?
A: Hand-tighten, then 1/8 turn with a wrench. The O-ring does the sealing — overtightening damages threads. The billet aluminum screw has much stronger threads than the OEM plastic — but the housing threads are still aluminum. Snug is enough.
Q: When should I rebuild vs. replace my Duramax fuel filter head?
A: Rebuild if: the housing body is physically intact with no cracks, and the problem is leaking seals, a soft primer pump, or a stripped bleeder screw — this $23.99 kit fixes all three. Replace the entire housing if: the housing body is cracked, the mounting tabs are broken, or the primer pump lever is physically damaged. See our complete billet housing assembly for a full replacement solution.
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