Common Rail diesel fuel ... Unfortunately, in the case of the Duramax, the Bosch CP4 fuel pump can become a weak link in the fuel system, creating several problems. Owners have voiced serious ...

Read more: 15 Popular Oil Filter Brands, Ranked Common Rail ... the case of the Duramax, the Bosch CP4 fuel pump can become a weak link in the fuel system, creating several problems.

While some have spoken positively about Duramax engines in the past, they have a variety of known problems. One of the most common over the years is problems with the fuel system. Earlier this ...