2019 Ram HD

Me Again wrote:

Bigfoot affair wrote:

Me Again wrote:
The failures of the early CP4's both 1 and 2's was the piston with a roller follower getting turned sideways to the pumps cam lobe. Bosch was unwilling to pay the holder of a patent to keep the piston from turning in the bore.

The Metal that contaminate the fuel system was from the roller and cam lobe.

They have been working to fix the issue.

This page shows a picture of a damaged roller. Fig 3

https://www.matec-conferences.org/articles/matecconf/pdf/2017/32/matecconf_icce2017_00020.pdf

This may be the Edelbrock patent that Bosch was unwilling to pay royalties to use.
https://patents.google.com/patent/US6473964B1/en

What do you consider early pumps?

2016 Ecodiesel cp4.2 failure Clicky

2016 Duramax cp4.2 failure clicky

2016 Powerstroke cp4.2 failure clicky

I could waste half the day posting this ****, they haven't made any changes to the pump to prevent the piston from turning in the bore...

Unless, Cummins installed a failure disaster device to save the rest of the fuel system... Aftermarket has them out for the Powerstroke Disaster prevention

Fuel contamination can lead to the piston in the bore. Ford had little or no WIF detection, which put them on the front page of the issue. And NO I WOULD NOT buy a truck with a CP4.

And I agree. Read a million times fuel contamination and high pressure pumps = failure.