ShinerBock wrote:
I think what Drittal is also trying to say is that the CP4 is more sensitive to contamination and wear over the CP3.
The CP4 has two pistons pushing out less volume of fuel at 29,000 psi while the CP3 has three pistons pushing out more volume of fuel at 24,000 psi. With more pressure, even the smallest of particles can wreak havoc on the fuel system. Add in the fact that the amount of pressure is being pushed by two pistons instead of three with less fuel to carry off the heat. Common sense will tell you which would be more sensitive to contamination and wear out quicker. That is like putting 20 psi of boost on a 4 cylinder engine versus just 15 psi on a V6. With that much psi in a small package, it is also a no brainer to believe that it going to grenade when it finally does go.
I agree that the CP3 is more forgiving without a doubt, but again dritals statements are typical mafia fanfare. I posted a link a while back to a person who works in warranty at Ford and his statement was Ford covers more warranty repairs than they reject. Having said that there has been some occasions that the dealer tech tried to void the warranty to get more $$$ money on the repair vs a warranty repair.
In addition I believe the CP4.2 is a more reliable pump than the CP4.1 simple because it has 2X the amount of diesel flowing through the pump providing more lubrication to the cam and the DLC coating.