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S&S Diesel Motorsport® 50 State LML CP3 Conversion Compatible with 2011-2016 GM LML Duramax Diesel (LML-CP3-CARB)

  • Based on 4 reviews
Condition: New
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$2,600.00 Why this price?

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Availability: Only 1 left in stock, order soon!
Fulfilled by Supersonic Performance

Arrives Friday, May 8
Order within 2 hours and 10 minutes
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Features

  • More durable plug-and-play replacement for the CP4
  • Does not require any ECU calibration due to internal pump modifications that enable the CP3 to match the output curve of the CP4
  • OE fit and function, including a proper dosing line directly from the pump for emissions equipment and injector priming
  • 50 State Legal / CARB Compliant (EO# D-756-4)
  • Two-year, unlimited-mile warranty

Description

S&S Diesel Motorsport, the world leader in common-rail diesel injection has developed a solution for CP4.2 high-pressure pump failures that have plagued the LML Duramax engine. The S&S solution is to remove the problem before it becomes a problem, by replacing the CP4.2 with a tried and true, bulletproof CP3 high pressure fuel pump. CP4 high pressure pumps are the Achilles heel of the LML Duramax engine because of high failure rates, and commonly taking out the entire, very costly, high-pressure system with it (injectors, rails, lines). S&S Diesel Motorsport offers the first CARB-compliant (EO D-756-4) 50 State CP3 conversion available for the LML. This includes all hardware necessary to replace the troublesome CP4 with a bulletproof CP3, requires no tuning changes, and still maintains factory emissions control equipment.

Brand: S&S Diesel Motorsport


Fit Type: Vehicle Specific Fit


Vehicle Service Type: Truck


Material: Cast Iron


Item Weight: 22 Pounds


Fit Type: Vehicle Specific Fit


Compatible with Vehicle Type: Truck


Auto Part Position: Front Right Lower


Outlet Connection Type: Barb


Inlet Connection Type: Hose Barb


Connector Type: BSPP (for outlet)


Gas Type: Diesel


Mounting Type: Engine Mount


Operation Mode: Automatic


Product Grade: Replacement Part


Material Type: Cast Iron


Body Material: Cast Iron


Specification Met: CARB, Federal


Item Weight: 22 Pounds


Outlet Connection Size: 0.38 Inches


Inlet Connection Size: 0.38 Inches


Brand Name: S&S Diesel Motorsport


Manufacturer Part Number: LML-CP3-CARB


Manufacturer: S&S Diesel Motorsport


Included Components: 50 State CP3 fuel pump, high-pressure fuel line, low-pressure fuel lines, adapter plate, hardware, IMV extension harness, fuel temp sensor mount, fuel rail plug, CARB sticker


Unit Count: 1.0 Count


Manufacturer Warranty Description: 2 Year Unlimited Mile


Product Style: Gerotor


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, May 8

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews


  • LML Duramax
An excellent conversion kit. A must have to save the LML Duramax
Reviewed in the United States on May 27, 2025 by Amazon Customer

  • Quality parts, but the instructions are a mess
I installed this kit on a 2015.5 GMC Sierra 2500 Denali Duramax. The good: the kit, once installed seems to work as advertised and the truck runs great. All the parts and components appear to be of good quality. I liked the inclusion of a sticker for under the hood that identifies the conversion done to the vehicle. The bad: the instructions are a mess, causing confusion and inefficiency with almost every step. The diagrams are often small, blurry and shown from odd perspectives, such as forward facing. The step by step instructions leave out much detail, leaving one to figure out what else has to be removed during disassembly. The order, especially for reassembly often has you reattaching a part, only to have to remove it again to mount the next part, Some steps are simply wrong, such as the location shown for bolting down the temp sensor. The diagram has you bolt it into a mounting hole for the AC compressor. Fortunately, I was able to find an alternative spot for it. The instructions include torque specs, but sometimes the imperial values are not included with the metric values. The entire description of how to remove the fan blade was completely incorrect for my vehicle. These are just a few examples. Be warned, the time and effort required to install this kit is significant. There are several fasteners that are in extremely tight locations, with very little access. This is not a beginner project and you need a pretty good range of tools to do the job. I highly recommend you get a topside creeper for this conversion. I can’t imagine trying to do it without one. I found the ABN foldable topside creeper to be a good value. In summary, quality components in the kit, but challenging to install, made worse by the poor/confusing instructions. ... show more
Reviewed in the United States on July 5, 2025 by mc8509

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