Took the day off from dump trucking and worked on try new 86 F250 today. I expected the fuel system to be a big problem and it is. I was able to get solid fuel flow up to the injection pump by some miracle and what’s in the tank really doesn’t look/feel/smell all that bad. I put on a new filter with 50/50 ATF and gray bottle Power Service since that’s what I had laying around. I tired every trick I knew but can’t get the injection pump to flow fuel anywhere except out the return. I pulled the pump and took the transfer pump section apart and as expected it’s got a lot of varnish and junk. The pump and injectors will be going out for a rebuild. I may pull a pump out of another truck I have just to see how this engine runs because the rebuild will be more than I paid for the truck.