https://cnrautoparts.com/exhau....st-uppipe-for-for-6-
Starting with the worst, we begin with the 6.7L Power Stroke’s CP4.2 high-pressure fuel pump. The twin-piston Bosch pump, which is responsible for pressurizing fuel as high as 30,000 psi, is notorious for self-destructing. And when it comes apart, metal debris flows out to the fuel rails, and is often sent through the engine’s expensive piezoelectric injectors. Worse yet, the fuel system’s return circuit is also contaminated, with the fuel tank, fuel supply (and return) lines and even the lift pump r
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