04.5-05 LLY Performance Discussion of Chevy and GMC Trucks with LLY Duramax Turbo Diesel Engines Related To Performance And Longevity

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Old 04-04-2009, 11:16 PM
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i want more fuel but i dont want to spend all that money on dual cp3. is there a cheaper way to get more fuel?
 
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Old 04-05-2009, 05:40 PM
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you can mod the fca and gear pump on the cp3


also adding a lift pump would help too
 
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Old 04-05-2009, 06:57 PM
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i have a carter lift pump
 
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Old 04-05-2009, 07:42 PM
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have you had your cp3 modded?
 
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Old 04-05-2009, 10:11 PM
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no do you know who could do it?
 
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Old 04-05-2009, 11:13 PM
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Old 04-05-2009, 11:38 PM
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is it a kit and is it hard?
 
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Old 04-05-2009, 11:43 PM
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You have to get to the fca first and pull it out (note that the write up is on a lb7 motor, but lly is very similar)

https://www.dieselbombers.com/lb7-bo...fca-k-fpr.html

and then pull it apart and modify it. it helps out with holding a bit more rail pressure. some people swap in a lbz fca cause they flow more but it can cause high rp at idle. but that can be tuned out with efi.

you got to be real clean and careful not to scratch anything in the fca. the plunger inside of it needs to move freely in the fca.
 
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