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

should i add a lift pump to my cp3 cp4 pump

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

dieselpowerproducts.comImage: dieselpowerproducts.comSome 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. It’s not fun if you have to prime it every time to get it started again.User Interaction Count: 12

Does a CP3 pump need a lift pump?

A lift pump should be the absolute first thing you do to the truck. Cp4 or cp3, doesnt matter. You need to get that fuel from the tank up to the injection pump. If you’re wondering if a lift pump will prevent the failure of the cp4 the answer is no.

Does a lift pump help a CP4?

Luckily, the addition of an aftermarket electric lift pump can help ensure that positive pressure (and no air) is supplied to the low-pressure side of the CP4. 2—and can be installed relatively affordably.

Does my Duramax need a 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.

Does a CP3 pump need a lift pump?

A lift pump should be the absolute first thing you do to the truck. Cp4 or cp3, doesnt matter. You need to get that fuel from the tank up to the injection pump. If you’re wondering if a lift pump will prevent the failure of the cp4 the answer is no.

How much HP does a lift pump add?

As a general rule of thumb, for most Duramax, Cummins and ’08-current Power Strokes, a 95 or 100-gph kit will support 500-to-600 hp, a 150 to 165-gph system will handle up to 800-to-900 hp and a 200-gph or more pump can support north of 1,000 hp.

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.

Should I put a lift pump on my LML?

Do you need a lift pump on your LML? You should strongly consider a lift pump for your LML (2011-2016 Duramax). Although there are many benefits a lift pump provides, your LML needs them for 2 main reasons, RELIABILITY & PERFORMANCE.

Which fuel pump is better CP3 or 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.

How do you prevent CP4 pump failure?

The problem with the CP4 pump is so well known that several companies sell expensive kits that cost up to $3,600 (before labor costs) to try to prevent the problem. Popular fixes involve boosting the fuel pressure with an additional pump, or replacing the CP4 with the more reliable, but less fuel efficient, CP3 pump.

Does 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.

What injection pump does the L5P have?

Denso HP4 injection pump

Does a CP3 pump need a lift pump?

A lift pump should be the absolute first thing you do to the truck. Cp4 or cp3, doesnt matter. You need to get that fuel from the tank up to the injection pump. If you’re wondering if a lift pump will prevent the failure of the cp4 the answer is no.

What is the purpose of a lift pump?

A lift pump can be defined as a low-pressure pump whose core functions is to transport fuel to a high-pressure pump. In older engines, fuel pressure is directed into the injection pump where higher pressure boosts it through an injector.

What’s better FASS or AirDog?

The FASS comes with a bracket that is specific to the model of vehicle, the AirDog is more generic, but allows more flexibility for user preferred install location. For ease of installation, I prefer the FASS setup, but for flexibility, I prefer the AirDog setup. This is your choice here.

Is a FASS fuel system worth it?

But it’s well worth it. The pump doesn’t have to pull from out of the top of the tank. If you want to upgrade your your truck it’s an awesome place to start. I would recommend Fass to everyone.

How do I know if my CP3 pump is weak?

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.

What does CP3 stand for Duramax?

CP3 = Common rail high pressure pump.

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.

What are the benefits of a lift pump Duramax?

It keeps the fuel rails from draining with saves the cp3 or cp4, depending on what truck you have. Plus, it provides extra filtration which you can’t have enough of. I highly recommend a lift pump for lml truck because of the cp4 price to replace compared to the cp3…

What does LML mean on a Duramax?

LML. The 6.6L RPO LML (VIN code “8”) is . It is a further advanced version of the LMM engine with the majority of the changes addressing a required drastic reduction in engine emissions.

Will a lift pump help with the CP4?

The lift pump will ease the strain on the CP4 but no guarantee it still won’t grenade. The extra filtration on lift pump helps, & run some lubrication like Stanadyne & good fuel is the biggest help. I watched that video Mikey52 posted some time ago, and that convinced me to do the conversion after I decided to keep my truck long-term.

What does the CP3 pump do on a Duramax?

But for some strange reason, the 6.6 Duramax came from the factory sans lift pump. The fuel takes the same path from the tank, through a filter, and into the injection pump, except now the CP3 is responsible for sucking fuel from the tank.

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 happens when you add more horsepower to a CP3?

Over time with the presence of vacuum, the rubber lines can actually collapse and cause a restriction, and if you add more horsepower, you increase the workload on the injection pump even more, and at a certain point, the CP3 simply can’t keep up any more.