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The Factory CP4.2 Pump Found on the LML Duramax has been known to be a problematic component. Even the slightest amount of fuel or water contamination can ruin the pumps internals leading to metal debris flushing throughout the entire fuel system. When these pumps fail it can lead to a repair job usually including all new injectors, fuel system sensors, fuel lines, and complete cleaning of the fuel tank and costing $8,000+. We set out to develop a solution for this issue and came to market with the first CP3 Conversion kit in 2013. The WCFab kit is tried and true and offers some items that other kits on the market today do not. A common issue we encountered is customers installing the CP3 Pump would break the brittle cast aluminum OEM pump mount bracket, so we designed a stronger Billet Aluminum piece to replace it and have not had an issue since.
The Street Series kit is recommended for use with Stock and Sportsman CP3 Pumps and mild performance builds. Any truck that is used in a performance application and is no longer under warranty we strongly recommend replacing the pump with the more robust and proven CP3 pump from WCFab.
Total Reviews (3)You must login to post a review.
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Reviewed by: Corbin02/15/2019 08:49PM
Product ownership: Less than 1 month
Purchased from: Wehrli Custom Fabrication - WCFab
Comments:
I bought this for my 2013 duramax because I did t want the dreaded cp4 blowing up. Item arrived quickly and package awesome. Customer service is the best in the business! I will buy all my truck needs from them again. Cp3 exergy pump was easy to install and runs awesome!
Reviewed by: Jon10/11/2019 04:45AM
Product ownership: Less than 1 year
Not purchased from: Wehrli Custom Fabrication - WCFabComments:
This kit went on fairly easy and after loading my PPEI cp3 tune she fired up and purred like a kitten. It runs a little harder in the mid range and put my nerves to rest knowing that I no longer have a cp4 waiting to grenade. If you don't know what you are doing then let someone who does help you or do it for you.
Reviewed by: Dane11/28/2022 05:51PM
Product ownership: A year or longer
Purchased from: Wehrli Custom Fabrication - WCFab
Comments:
This is a great kit as it came with everything that was needed parts wise for the conversion on my 2016. I installed this a couple years ago along with some other parts at the time. With my mechanical background, the installation was smooth and straight forward. If you are not mechanically inclined, I would recommend you find someone to install this for you. I highly recommend this if you want to eliminate any worry about a CP4 failure.