The metal fragments can infiltrate the high-pressure fuel lines that feed ... If your truck is powered by an LML Duramax or 6.7L Cummins, you could replace the CP4 pump by using a CP3 conversion ...

Unfortunately, in the case of the Duramax, the Bosch CP4 fuel pump can become a weak ... While some owners were able to qualify for a pump replacement under warranty, others required further ...