Asked by: Melitina Ruess
automotive off road vehicles

What is a cp4 on a Powerstroke?

Last Updated: 15th June, 2020

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CARB APPROVED. "Disaster Prevention Kit" ( CP4 Bypass Kit ) As many 6.7L Powerstroke owners have become painfully aware, the high pressure fuel pump (also known as a CP4 pump) has a design weakness. When the CP4 pump fails, it will shed tiny particles of metal throughout the entire high pressure fuel system.

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Also asked, why do cp4 pumps 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.

Similarly, does Cummins use a cp4? So we talked to Ram engineers at the media event and the Cummins does not use the CP4 injection pump as people have been speculating.

Beside above, how does a cp4 pump work?

Operation of the CP4 The pump camshaft is driven by belts, chains, or cogwheels and moves the pump pistons to generate the required high pressure. The fuel is delivered as required using an integrated cogwheel pump or electric fuel pump. The engine control unit enables the delivery of the required quantity of fuel.

What is a cp4 pump?

Found on '11-to-present Power Stroke and Duramax engines, the CP4 is a more advanced pump despite flowing less fuel, with external high-pressure circuits and a maximum pressure of 29,000 psi. Maximum pressure checks in at 24,650 psi, but it's the pump's volume that makes it a winner on the Ford engine.

Related Question Answers

Pedro Merkens

Professional

Do lift pumps add power?

A lift pump will only add power if the fuel system cannot supply enough fuel. Typically a lift pump kit will add power to anything over 350 RwHp on a Duramax. It also smooths the engine out and help prolong the life of the CP3. The truck does do some sled pulling and racing as well as a daily driver.

Nair Blaschke

Professional

Why put a lift pump on a Duramax?

Pushing your Chevy or GMC Duramax diesel beyond its factory power levels is going to require a more robust fuel system. Part of this upgrade should include an aftermarket Fuel Lift Pump to help you maintain proper low-pressure fuel supply to the injection pump feeding your injectors at up to 30,000 psi.

Fanka Unterbaumer

Professional

What is a cp3 conversion?

The Industrial Injection 436401 CP4 To CP3 Conversion Kit is a sure way to increase reliability and performance of the fuel system in your 2011-2016 GM 6.6L Duramax LML. Unlike other CP3 conversion kits on the market, the Industrial Injection has no start-ability issues.

Jozsef Kurlbaum

Explainer

What year Duramax has injector problems?

A water pump failure (which is relatively common) will also likely result in overheating. Premature injector failure was a critical problem for the 2001 to 2004 model year Duramax LB7.

Elenor Palumbo

Explainer

Will a lift pump help my Duramax?

By installing the larger and more powerful Titanium series diesel fuel pump you can decrease the stress on your CP3 pump and let it do what it does best, push the fuel into your injectors. Keep in mind however, the Flow Enhancers are only intended for the use with a stock or factory tuned Duramax diesel engine.

Pawel Langhof

Explainer

What does LML diesel mean?

LML. The 6.6L RPO LML (VIN code "8") is the 2011–2016 version of the Isuzu/GM Duramax V8 diesel engine. It is a further advanced version of the LMM engine with the majority of the changes addressing a required drastic reduction in engine emissions.

Maghnia Carballude

Pundit

What year Duramax has cp4 pump?

The 2011-2016 Duramax suffers from a high pressure fuel pump issue unique to this year range. Failure of this CP4 pump is usually catastrophic, causing instant contamination of the entire fuel system with metal particulates. Chances are, if you're looking at this page, you're well aware of the problem.

Piper Quagliaroli

Pundit

What is a cp4?

Mounted in the engine bay, directly feeds high pressure to the common rail and draws fuel from the tank. Commonly called the Cp4. LML: Short hand for Chevy and GMC 6.6L, V-8, turbocharged, Duramax engines available in the 2011 - 2016 HD trucks. Brands: DuramaxTuner.com is an Authorized Dealer for FASS.

Robby Barbancho

Pundit

What trucks have cp4 pump?

2011-2016 Chevrolet Silverado 2500HD (6.6L V8 Duramax LML engine) 2011-2016 Chevrolet Silverado 3500HD (6.6L V8 Duramax LML) 2011-2016 GMC Sierra 2500HD (6.6L V8 Duramax LML) 2011-2016 GMC Sierra 3500HD (6.6L V8 Duramax Diesel Trucks LML)

Dwana Laass

Pundit

Do all cp4 pumps fail?

The CP4 pump fails when it doesn't get lubrication, and all of the pump's lube is from the fuel. Ultra low sulfur fuel doesn't have a lot of lubricity in it anyway, so any small amount of fuel contamination can cause the failure.

Chafiq Roeber

Pundit

What is a High Output Cummins?

less than the previous-generation engine, yet delivers more power and torque. The Cummins 6.7L inline-six turbo diesel is offered in two variants; standard output 370 horsepower (850 pound-feet of torque) and high output 400 horsepower (record-setting 1,000 pound-feet of torque).

Billye Weingarth

Teacher

What fuel pump does the 6.7 Cummins have?

2 high-pressure fuel pump is used as opposed to the age-old CP3. Though this twin-piston pump is capable of producing 39,000 psi, Cummins and Ram have stated that peak injection pressure will check in around 29,000 psi in this application.

Bonoso Kubik

Teacher

What does a lift pump do for a diesel?

What They Do. The job of a lift pump is to supply low pressure fuel (from the tank) to the injection pump on the engine. Most lift pumps, aftermarket or OEM, provide between 8-to-15 psi worth of supply pressure (aside from the 7.3L, 6.0L and 6.7L Power Stroke engines, which call for 45-to-65 psi).

Suhail Zanchi

Teacher

Does a Duramax have a fuel pump in the tank?

Duramax. The Duramax is probably the most responsive to an aftermarket lift pump. The GMC and Chevy Duramax pick-up trucks do NOT have a lift pump to supply fuel to the engine. From the factory, the CP3 injection pump is the truck's only means of getting fuel from the tank to the engine.

Scottie Camisa

Teacher

What does a Fass pump do?

FASS stands for Fuel Air Separation System and is a combination diesel fuel lift pump and fuel filtration system that is designed to improve your diesel truck's fuel mileage, engine performance and extend the life of your diesel injection system.

Immacolata Homberger

Reviewer

How much is an injection pump?

The average cost for a diesel injection pump replacement is between $1,807 and $2,846. Labor costs are estimated between $569 and $718 while parts are priced between $1238 and $2128.

Ali Matsevich

Reviewer

Does a 2015 Duramax have a lift pump?

2015-2016 Duramax 165GPH Lift Pump Features:
Preset 8-10 PSI Fuel Pressure. Complete Replacement Pump. 165 Gallons Per Hour Flow Rating. Removes Water, Air and Debris From Diesel Fuel.

Enrica Novalbos

Reviewer

Where is the fuel pump on a 6.6 Duramax?

The pump is located in the engine valley (between the heads, at the front). Don't worry about it or mess with it, just yet. If you have stalling or no start issues, it's probably air in the system. Try pumping the primer (pump on the filter housing) until it is very hard to pump.

Boulus Casale

Reviewer

What is a Duramax cp3?

The Fleece Performance CP3K is a modified Duramax LBZ CP3 designed to eliminate the factory fuel flow restriction that begins at 3,000 RPM. If you have a stock CP3 pump you are losing fuel flow and rail pressure after 3000 RPM, which correlates to lost horsepower when you need it most.