Can LML/LGH CP4 pumps be repaired?

can lml lgh cp4 pumps be repaired

How common is CP4 failure LML?

I have read that as much as 7% of CP4 fail on LML Duramax.

How much does it cost to replace a CP4 pump?

The “CP4” injection pump, as it’s called by many, is the heart of these diesels, and in the past few years it has garnered a reputation for catastrophic failure, resulting in repair costs north of $8,000.

How long do CP4 pumps last?

The result is the formation of air bubbles inside the CP4. 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.

How common is CP4 failure?

But how common is CP4 failure? The CP4 has been documented to fail mostly in cases of 100,000 miles in the USA. Other forums have disclosed that the failure rate is within 5-7%, specifically for LML Duramax engines. Despite this, the pump is well cherished by a lot of diesel engine enthusiasts.

Is there a recall on CP4 pump?

Stellantis (FCA US, LLC) is recalling approximately 222,410 units of its 2019 to 2020 Ram 2500/3500 pickups and Ram 3500/4500/5500 Chassis Cabs equipped with the 6.7-liter Cummins turbo diesel. The recall-affected trucks are equipped with the Bosch CP4 high-pressure fuel pump (HPFP) that could fail prematurely.

How can you tell the difference between CP3 and CP4 pumps?

Basically whe a cp3 quits working it just quits without exploding. It’s typically a slow decline. The cp4 on the other hand doesn’t have a pinned piston and if it rotates slightly it tends to explode and send tiny bits of metal all through your fuel system.

How do I know if my CP3 pump is bad?

There may be a surge at idle due to low or no fuel supply pump pressure to the high-pressure pump. Knocking can be heard if the actual versus desired are too far apart which may be a bad FCA or Fuel Control Actuator.

Will a lift pump prevent CP4 failure?

Prevent CP4.

An aftermarket lift pump system is the most affordable way to keep the CP4. 2 alive. FASS, AirDog and Fuelab are the big names in town here. Each of them offer a complete system that not only provides sufficient fuel supply pressure for the CP4.

Is the CP4 covered under warranty?

Yes they covered it. First thing they did was test for water in the diesel. When they found no water they covered the repair. He really had low mileage.

What years did Ford use the CP4 pump?

The CP4 was standard equipment on the Ford 6.7L Powerstroke. 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.

What year did RAM switch to CP4 pump?

But that 15-year run came to an end in when Ram made the somewhat questionable decision to switch the injection pump to the CP4. 2. Diesel owners in the know were somewhat frustrated with this decision, but to understand why, we need to look at the track record of each pump.

Is the CP4 2 better?

Although the CP4. 2 moves less fuel volume than the CP3 (roughly 20-percent less according to the output of LML Duramax CP4. 2’s), it is substantially more efficient and produces higher peak pressure (30,000 psi vs. 26,000 psi).

What does a CP3 pump do?

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). The fact that the CP3 came from Bosch’s heavy-duty line of injection pumps also speaks to its great reliability, as it was designed to play a vital role in million-mile engines.

How many miles can you get out of a LML Duramax?

The Duramax engine should last up to 300,000 miles before needing major repairs if you are wondering how long it will last. The number of miles an engine can run depends on how well it was maintained and driven over its lifetime.

Does Duramax use CP4?

The CP4. 2 is used in GM 6.6L Duramax LML, Ford 6.7L Power Stroke, and 2019-to-present 6.7L Cummins powerplants.

What year Cummins has CP3?

6.7 Cummins CP3 Injector Pump |

How does a CP4 bypass kit work?

Our bypass kit mounts to the CP4 pump and changes the routing of the fuel flow so that lubricating fuel from the crankcase is directed back to the fuel tank to be filtered before going through the fuel system again.

How do you test a diesel injection pump?

The inj pump does all the really hard work of delivering the fuel to the cylinders via the injectors. To test the lift pump, once the engine is running, open the bleeder at the fuel filter. The engine should stay running and the fuel should really squirt out.

How much fuel pressure does a CP3 need?

If you are running a CP3 in a high-performance application, we highly recommend installing a fuel supply pressure gauge to ensure there is correct fuel pressure at all times. Recommended feed pressures for CP3 and CP4 equipped engines: Dodge/Cummins ’03 – ’16 (5.9L & 6.7L) no less than 8 PSI / no more than 15 PSI.

What causes common rail failure?

Water contamination: Another common cause of Common Rail injector failure is contamination from excess water in the fuel. If not stored or handled correctly, water can enter the fuel and will react with the chemicals in it to corrode metal surfaces and reduce lubrication between the moving parts.

Can a Bosch CP4 pump be repaired?

The defendants are also refusing to fix the trucks under warranty. Additionally, repairs are fruitless, as no repair will fix the issue as long as the vehicle with the CP4 is being filled with U.S. diesel. The basis of this defect is the Bosch-supplied CP4 high pressure fuel pump.

What happens when a CP4 pump fails?

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.

Can fuel additives be used to prevent CP4 pump failure?

Some fuel resellers mix lubricity-increasing additives into their fuel prior to sale, but this is not consistent and not well-regulated. Using a commercially-available diesel fuel additive can be helpful, but cannot be guaranteed to prevent CP4 pump failure.

What is the lubrication of a CP4 injection pump?

Lubricity is most commonly defined as the ability of a fluid to minimize the degree of friction between surfaces in relative motion under load conditions. The CP4 injection pump creates higher pressures with less volume than its predecessor, the CP3 pump.