I put this 12v in my truck because of a junk powerstroke that was in it last. So I am now noticing a knock towards the bottem end on the rear of the motor number 6. So I changed all injectors to rule that out. So when I bled the lines on all cylinders made motor idle down, but when I got to number 6 and I cracked the line on the pump , knock went away and the slap in the exhaust instantly stopes. Anyone have this happen? Would p pump do it or am I looking at wrist pin or rid knock? Thanks guys.

 

Well I figured it out for those who might have this prob. When I bought my p pump the number 6 plunger was missing. So I took one off my old pump and bolted it down. Come to find out it was slid forward and not back like the rest of them (could hardly notice the diff.) when I slid it back knock went totally away and truck sounds great now. Unreal what little things make or break!!!