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John C Garage CP3 Conversion For 2011-2016 Duramax LML With CP3 Pump!

John C Garage CP3 Conversion For 2011-2016 Duramax LML With CP3 Pump!

Our very own John C Garage CP3 conversion kit for your 2011-2016 LML Duramax with brand new Exergy CP3 pump included! There is no core charge on the CP3 and you do not have to send your CP4 in!  Have a CP3 pump already and want just the hardware kit? We sell that HERE.


Prep Pump Details: You can have us physically prepare the CP3 pump prior to us shipping it out for you. This will consist of us professionally installing the adapter plate and fuel feed and return line fittings onto the pump for you. Doing this will shorten your install time and will only require you to put on the CP4 pump gear onto the CP3! This will also take any guess work out of the hardware for you. I have never seen this service offered before so we might be the only one to do it.


We keep these kits in stock so same day shipping in most cases! Preparing the pump in some cases may delay shipping but usually 1 business day. 


This conversion kit will require calibration adjustments from your preferred tuner to accomodate a CP3 on your Duramax lml.


This kit consists of only the best components possible which took us years to perfect with hands on experience installing these kits!  You'll receive a our in-house low pressure fuel line to eliminate the factory fuel filter (for those running a lift pump), and our JCG return fitting kit (2nd picture). Doing this gives the cleanest possible install and eliminates pretty much all of the factory fuel lines. Less clutter, less chances of a leak! If you need to keep your factory fuel filter in place, just let us know and we can provide the needed hardware to continue to use that.


Please reference this guide below when selecting CP3 size.


Sportsman is capable of 650HP

10mm is capable of 750HP

12mm is capable of 900+


Included Hardware:


Brand new Exergy (LBZ Based) CP3 pump of your choice

Low pressure fuel line for 2011 or 2012-2016 (You choose) 

AN return line kit with push-lok fitting

CP3 adapter plate

x3 Allen socket bolts to mount CP3 to adapter plate

x3 lock washers for Allen socket bolts

x2 orings for adapter plate

Plug and nut for passenger fuel rail

High pressure fuel line from CP3 to passenger fuel rail

1/2" barbed CP3 inlet feed fitting

9th injector plug for return port

JCG 9th injector down pipe plug

FPR extension harness

JCG 3D Printed Fuel temp sensor bracket and stainless mounting bolt


This is the most complete kit on the market and provides the best fit and finish!


Any questions, let us know!

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