CP 4 PUMP ARTICLE

[CAVEMANN]

This is a good article on the HIGH PRESSURE FUEL PUMPS used in the ECOS and several other diesels.

What Is CP4 Injection-Pump Failure?

CP4 injection pumps are the weak links in some late-model diesel fuel systems. Here are insights on what happens when they break, and ways to prevent it from happening.

www.fourwheeler.com

 

[TC Diesel]

The ways listed in article are lacking. I have CP4s that have 500K miles Without the so called fixes listed.

The CP4 is a particle maker when it starts to fail.

I wonder if CARB is aware the 9th Injector pressure on the CP4 Body port (Duramax 2011-16) is considerably higher than the CP3 return port. I have never tested the 9th Injector so I would have to investigate to confirm it works or Not. Most conversions consist of Competition use which do away with the 9th Injector.