Are there any cracks in the hose before the fuel filter assembly? What you should do is disconnect the fuel hose that runs from the fuel filter to the injection pump. Keep the one end of the hose on the injection pump, but disconnect the other end from the fuel filter. Now pump the fuel filter button a few times to see if fuel is coming from the tank to the filter assembly and out of the hole where you disconnected the fuel hose. If no fuel is coming up after many pumps on that fuel filter, then there is your problem. Some people refer to a diesel injection pump as a fuel pump also, but I don't hear it mentioned that way much. Is your 85 Toyota a 2L or 2L-T engine and is it 2WD or 4WD? Currently, I'm looking for an 84-85 Toyota diesel pickup cab to drop on my 87 Toyota frame. It has the 22-RE gas engine, but I am a diesel gearhead and want to change it over to diesel.
1987 Toyota 1 ton dually w/ 9 ft utility bed
(FOR SALE- PM if interested)