Check rail pressure when the engine is off. It should be zero PSI, plus or minus 500 PSI. Look for low or no supply pressure, supply pump or fuel filter etc. Excess particulates can be a factor during excessive idle time due to injector tips having a build up of carbon due to the cold.
How much does it cost to replace a CP3 on Duramax?
The cost of doing just the LML CP4. 2-to-CP3 conversion is about $3,500 for parts and labor. That might take the breath away from many Duramax owners, but compared to the $8,000-plus it costs should the CP4.
Does a CP3 pump add horsepower?
Double Your Potential. On its own, the CP3 produces 24,000 to 26,000 psi of fuel pressure and can support a truck making approximately 550 horsepower at the wheels. When combined with a second (stock displacement) pump, the potential to make more than 1,000 horsepower is on the table.
What Duramax has CP3 pump?
The venerable CP3 is used in previous generations (’01-to-’10) of Duramax trucks, and all the 6.7L, 24-valve (’03-to-present) Cummins powerplants.
How do I know if my CP3 is failing? – Related Questions
What year did Duramax go back to CP3?
From 2011-2016 GM also used the CP4 in the LML & LGH Duramax engines, switching to the Denso HP4 in 2017 when the L5P was released. Interestingly, Dodge waited eight full years until 2019 to incorporate the CP4 on the 6.7L Cummins and then reversed course relatively quickly, going back to the CP3 in 2021.
How many miles does a CP3 pump last?
The Bosch CP3, used on the ’01-to-’10 Duramax and ’03-to-current Cummins engines, is known to last 250,000 miles or more before needing to be replaced. Of course, performance enthusiasts also know these pumps are only capable of supporting approximately 500 hp.
What year Duramax has fuel pump problems?
GM intentionally put a defectively designed CP4 fuel pump in every one of its 2011-2016 Duramax diesel trucks—and, as the court noted today, from mile one it will begin to fail. There is no fix.
Do you need a tune for a CP3 conversion?
No Tuning Required Kits
This kit does not require tuning because it’s designed to work with the factory setting. In other words, the CP3 fuel injection pump in this specific kit is a direct replacement for the factory CP4 pump, meaning no altercations need to be made in order for it to work.
Can a CP3 be rebuilt?
While CP3 repair is not usually considered a “DIY” project, sometimes minor issues such as a leak can be corrected in the field. For more major concerns additional hard parts, special tools, and test equipment will be required for a complete repair.
Does the LMM Duramax have a CP3?
2006 – 2010 Chevy GMC 6.6L Duramax LBZ LMM This kit includes a new stock CP3 Pump.
Does a LLY Duramax have a CP3?
The LLY Sportzman is built out of a brand new LBZ based CP3 pump. It is internally modified to support high rpm applications while delivering maximum fuel flow with out modifying the cam. This pump supports 650hp depending on injector size and health.
Does a LML have a CP3?
S&S Diesel Motorsport offers the first CARB-compliant (EO #D-756) 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 for $2,600 MAP.
What year did Duramax get the CP4?
In this collection of parts, for all common-rail diesel fuel systems, basic-to-extreme performance starts with the high-pressure injection pump; a CP3 for most 2001-to-2010 6.6L Duramax, and 2003-to-2018 Cummins engines, and CP4 for D-Max LML (2011 to 2016), and 6.7L Ford Power Stroke oil burners of 2011-and-later
How common is CP4 failure Duramax?
GM intentionally put a defectively designed CP4 fuel pump in every one of its 2011-2016 Duramax diesel trucks—and, as the court noted today, from mile one it will begin to fail. There is no fix. The only question is how much will it cost the customer? Generally the answer is in the tens of thousands of dollars.
How common is CP4 failure?
The Cause of the CP4 Failures: Lack of Lubricity in the Fuel
The Bosch CP4 fuel pump has an unusually high failure rate in the U.S., upwards of 7%, when compared to 1% failure rate in Europe.
What mileage does CP4 fail?
Air in the pump means that metal rubs against metal, causing accelerated wear. This will eventually cause the CP4 to fail, often around 100,000 miles. Before it fails, metal shavings are produced by the CP4, which travel into the fuel injectors and the fuel lines with catastrophic results.
Is there a recall on Duramax CP4?
In the meantime, a massive recall was announced for CP4. 2-equipped ’19 and ’20 trucks on November 12, 2021. According to the NHTSA at the time of the initial report, the recall applied to Ram’s 2500, 3500, 4500 and 5500 series trucks, and 222,410 units were affected in total.
Does a CP3 pump need to be timed?
Unlike previous (pre-common-rail) injection pumps, it has fewer tasks to perform. The CP3 injection pump’s sole job is to create and regulate high-pressure fuel (it’s not timed with the engine’s crankshaft and camshaft).