how do i know if my cp3 is bad

The way you tell if you have a bad cp3 is if it is not keeping up with rail psi. And you should be to see a leaky pump too. scoobert

Full Answer

What causes a CP3 pump to stop working?

High-Pressure Injection Pump (CP3 Pump) Most starting problems due to low pressure are caused by bad injectors as a result of erosion of the check ball seat. The pressure is supposed to default to a max of 26,107 PSI when you unplug the fuel control actuator. The pump cannot build an adequate amount of pressure if the injection system has a leak.

How much fuel pressure should a CP3 pump have?

Where there is a low fuel supply or none at all there should be 10 to 15 PSI to the high-pressure injection pump or the CP3 at idle. You will need to monitor the rail pressure to be sure that during cranking you have over 4000 PSI. If it is not, a hard start could be caused by one, or even more, injectors.

Do injectors go through CP3 first?

Generally, the injectors are afflicted first, however, contaminants also will go through the CP3 pump. To curtail injector cackle, the CP3 must be “phased” with these engines during installation.

How do I check my CP3?

You can simiulate max output for the CP3 by unplugging the FPR and fuel sensor. This forces the CP3 to put max output on the fuel rail. To do the check you will have to pull you glow plugs and watch excessive fuel from coming out the glow plug holes.

How long does a CP3 pump last?

250,000 milesThe 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.

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.

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.

What happens when CP3 pump fails?

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.

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).

What causes low fuel pressure in a diesel engine?

Three of the most common causes of heavy equipment low fuel pressure are a faulty regulator, a fuel pump malfunction or problems with the fuel lines.

How does a CP3 fuel pump work?

5:5612:12What is a cp3 and how does it work - YouTubeYouTubeStart of suggested clipEnd of suggested clipThis pump supplies pressure to you know gear driven pump. It supplies pressure to the main pistonsMoreThis pump supplies pressure to you know gear driven pump. It supplies pressure to the main pistons which make your main pressure your big pressure so once the fuel.

What pressure does a common rail diesel run at?

2,000 BAR – 29,000 PSIOn diesel engines, it features a high-pressure (2,000 BAR – 29,000 PSI) fuel rail feeding individual solenoid valves, as opposed to a low-pressure fuel pump feeding unit injectors or pump nozzles.

What are the signs of a failing injector pump?

Dirty Fuel Injector SymptomsThe Engine Misfires. Dirty fuel injectors may cause your vehicle's engine to misfire. ... Idling Gets Rough. Does your vehicle sputter and shake when you're at a stop sign or sitting in traffic? ... Your Gas Mileage Tanks. ... The RPM Needle Starts to Dance. ... Your Car Won't Start.

How do I know if my diesel injection pump is bad?

Signs of a Failing Diesel Fuel PumpSqueaks, squeals and other high-pitched sounds: If your vehicle starts squealing or making unusual, high-pitched noises, this could be a sign that your diesel fuel pump is going bad. ... Difficulty accelerating: Are you having trouble getting your vehicle up to speed quickly enough?More items...•

How do you know if your injection pump is bad?

Is My Fuel Pump Going Bad? Here Are 8 Signs It Is!Fuel Tank Noise. A damaged fuel pump might make a loud, whining sound that you'll hear from your gas tank. ... Difficult Starts. ... Sputtering Engine. ... The Actual Stall. ... Power Loss. ... Surging Power. ... Lower Fuel Efficiency. ... Dead Engine.