Beast in Diesel form..

1995-1998 1/2 Cummins 12 valve engines used a low pressure fuel system [lift pump on block] just like a gas engine,in mid year 1998 they changed over to a 24 valve engine and started using an in tank pump along with a lift pump creating a high pressure system [the mechanical lift pump was problematic] and was prone to falure if that happens the low fuel pressure [fuel cools the moving parts in the injection pump] destroys the internals of the injection pump [they came up with a modified aftermarket kit] calle a fass system that removes the mechanical pump therefore avoiding falure. This is my reason for sticking with 12 valve engines,plus 12 valves are all mechanically controlled where as the 24 valve engines are computer controlled.