FWIW, My hot rod cummins had the death code the VP44. My FASS pump had volume but not pressure. I fixed the fuel pressure issue, cleared the codes and the truck ran great. I had a friend that had the same issue. Once he figured out the low fuel pressure issue, his injection pump ran great, even with the VP44 death code. If he has the funds, steer him towards a good aftermarket lift pump if his injection pump needs to be replaced. It's expensive but if he plans on keeping the truck, it will be worth it.