This hopefully isnt the injection pump, but sounds like it could be. I had the injection pump replaced 3 months ago so maybe it wont be it. But drove the truck all day and then topped off the tank and put some additive in and drove home, 10 min later the truck started to run really rough and then I shut it off. Replaced the fuel filter and checked for jelling but it all seemed good. The lift pump is a BD. I didnt check the pressure in the banjo fitting going into the fuel filter, for the lift pump.