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USD 133.95
Part #: GM12642623

GM 12642623 Fuel Filter Head Assembly

2004.5-2010 GM 6.6L Duramax
Part #: GM12642623
★★★★★ ★★★★★ 8 Reviews
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The GM 12642623 Fuel Filter Head Assembly for your 2004.5-2010 GM 6.6L Duramax is an OE factory replacement for your GM Duramax. Over time, the stock fuel filter head can leak or become damaged causing poor running conditions, hard starting and more. This Fuel Filter Head will restore proper operation to your fuel system. 

  • Direct Replacement 
  • Fits LLY/LBZ/LMM Engines 
  • Filter & Water In Fuel (WIF) Sensor Included


  • MFG. Number 12642623
  • Manufacturer Name GM / ACDelco
  • Shipping Weight 2.70 lb.
  • Shipping Length 12.28 in.
  • Shipping Width 8.28 in.
  • Shipping Height 8 in.
  • Fuel Type Diesel
  • Prop 65 WARNING: Cancer & Reproductive Harm -


★★★★★ ★★★★★
5.0/5 Stars out of 8 Reviews
Duramax fuel filter housing
(PA) | August 7th, 2020
I was skeptical at first. Price ranges were all over the map. The fact that it came with an AC-Delco filter was reassuring. Fitment was flawless. If its not OEM it sure fit like it was. Installation was a breeze. Just remember to start both bolts bolt, 2-3 turns, together before attempting to seat them.
Verified Buyer
Filter head
(South Carolina) | July 27th, 2020
1198525 My Duramax died on me. At least it was in the yard. Convenient for me. So I identified the problem and within minutes I had it ordered from XTreme. Amazing service and was shipped out next day. Has worked flawless. I’ve replaced it twice now the factory replacement from you is way better than the eBay special I did the first time. I’ll be ordering from you from now on.
Great item
(South Carolina) | July 26th, 2020
Perfect fit. Fixed my problems. Only problem was getting fuel lines off old filter head.
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Questions and Answers

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Most Popular Questions

Will this work with my LB7?
View Staff Answer 

The GM 12642623 is a direct fit for 2004.5-2010 GM 6.6L Duramax 6.6L.

That being said, the Fuel Filter Head Assembly can be used on LB7 applications. This requires additional fuel line and rerouting to work properly. (You will not have the ability to reconnect the filter head heater wires. This will not cause any CEL’s or issues.)

Click Here for the LB7 Kit

Will this work on a LBZ ?
View Staff Answer 
This works for LLY, LBZ, and LMM Duramax trucks.
Does this come with the filter?
View Staff Answer 
Yes, this includes the filter!
There are two different applacations for filter housings will this work on either one?
View Staff Answer 

The GM 12642623 Fuel Filter Head Assembly will fit the 04.5-05 LLY, 06-07 LLY/LBZ, and the 07.5-10 LMM

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