6.4 Powerstroke reliability fix. Everyone talks about why these engines fail… almost nobody talks about how to actually fix them. After breaking down all the common 6.4 Powerstroke problems, here’s the real solution. The failure point is the K16 injection pump, and what gets into it. Water Air Debris Once contamination hits the high-pressure fuel system, it takes everything out. Here’s what most people don’t realize: The factory fuel system has two filters… but no real water separation. You’ll g