Starting in 2011, Ford and General Motors began using Bosch Mobility CP4 pumps to provide high pressure fuel to their diesel engines. GM used the pump on its 6.6-liter LGH and LML Duramax diesel ...

In fact, while examining the most reliable Duramax diesel engines and which to avoid according ... Unfortunately, in the case of the Duramax, the Bosch CP4 fuel pump can become a weak link in ...