What is the difference between a CP3 and a CP4?

what is the difference between a cp3 and a cp4

What is the difference between a CP3 and a CP4?

Should one decide to “tune” the engine, a CP3 can support more horsepower than the CP4 because of the higher fuel volume it’s able to feed the injectors. The CP4. 2 is said to support fuel for only about 525 horsepower, while a CP3 can support up to 800 horsepower. CP4.2 is a 2 piston dual cam fuel injection pump versus the CP3 is a 3 piston single cam injection pump. Basically the CP4 runs at a lot higher RPM’s with it being a dual cam versus single cam therefore more heat and a lower contamination tolerance.User Interaction Count: 5

How can you tell CP3 from CP4?

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 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.

How long does CP4 pump 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.

Does a CP3 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 year did Dodge use CP4?

From 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.

What does CP3 pump stand for?

CP3 = Common rail high pressure pump.

How can you tell CP3 from CP4?

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.

What injection pump is in the L5P?

Denso HP4 injection pump

Are all CP3 pumps the same?

All factory CP3s share the same displacement. However, due to slightly higher efficiency right out of the box, the Duramax pump will flow 195 to 200 lph on a flow bench, while a Cummins pump will put out 180 to 185 lph.

Does the L5P have a CP4?

Duramax L5P Reliability

The L5P is considered the most reliable post-emissions Duramax made to date. With the removal of the CP4.

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).

Who uses CP4 pump?

What Make/Models are equipped with the CP4 pump – The CP4 was standard equipment on the 2011-present 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.

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.

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.

How much HP can a stock CP3 handle?

A healthy CP3 will handle 30% overs fine. 45% overs will drain it on a long run if its older. Lift pump is a must for anything over stock that’s tuned over +150hp.

How much power can a CP3 handle?

In both Cummins and Duramax applications, the factory Bosch CP3 pumps can only flow enough fuel to support about 600 hp at the wheels. Adding more fuel via larger injectors or a bigger pulse width tune at more than 600 hp will result in a drop in rail pressure, which leads to less horsepower.

What year did Dodge use CP4?

From 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.

Is Ram going to recall the 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.

What fuel pump is in a 2021 Cummins?

Per information from owners taking delivery of 2021 Ram pickups with Cummins diesel engines, as well as photos I’ve seen on social media, it appears that Ram/Cummins have gone back to the old Bosch CP3 fuel injection pump.

How many miles are CP3 good for?

Forever as long as filtration is kept up. 01-02 are known to give out around . If you need a regulator, just bite the bullet and put a CP3 in it.

Should I get a CP3 or a CP4?

A lift pump, good filtration, and additive use are all good things and will likely prolong a CP4’s life (as they would with any injection pump). But the CP4’s design issues – steep cam profiles and no restraints on piston rotation – were enough to make me uncomfortable with it. The CP3 is arguably superior.

What’s the deal with the CP4?

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. That includes rail lines, injectors, return lines and finally your tank. Sometimes it just rotates enough out of alignment to send metal to the injectors and shuts down before it goes POW.

Should I add a lift pump to my cp3/cp4 pump?

Some have claimed that it’s extra work for the CP3/CP4 pump that should be corrected by adding a lift pump, ideally near the fuel tank. For the older trucks, a common issue is for the line to develop a small leak and you lose prime.

What causes a CP4 pump to fail?

There are many theories as to why the CP4 pumps fail, but it is typically associated with a lack of lubricity. This ultimately ends with metal shavings being released into the fuel system. One potential contributing factor is the ultra-low sulfur diesel (USLD) fuel available at the pump nowadays.