Have had the 86 6.9 running after 12 or more years. Has been grate to here it run after all these years. Motor sounds very good to start with but that did not last long as the fuel system looked like the Valdez ran a ground. Did know that fuel can come out of so many places. To start with the fuel tank was removed , cleaned, replaced fuel sending unit ,original fuel water separator replaced along with a new fuel pump and filters . That helped get the project off the ground. Injector pump leaking from shaft. Return lines all leaking. Started looking at all the candy store pump rebuilders that will start with a stock pump all the way up to how fast do u want to blow it up. I am looking for a some advice from anyone that has been down this road. This is my first 6.9 . Many seem like good choices . I seem to find the moose pump , classic diesel design come up along with many others. Found that there is a major price difference in the pumps and injectors. Can any one shed a little light on these pumps and injectors . I do not want to sink a ton into these parts , on the other hand I would like to think that the best choice might make it a one time deal to start with.