You may be dealing with a problem that had nothing to do with a clogged fuel filter. Filters do clog and water can get into fuel but I am amazed at how many times I have witnessed a knee jerk replace the fuel filter and just complicate whatever problem was going on. I said that just to help you or someone try to think what may have been the problem originally. If it was a clogged fuel inlet then what ever chance the tractor had of running is taken away because the successful recovery from changing the fuel filter is tied to having every thing else working as it should.
Many other possibilities. Just have to systematically work back. My beginning approach is to have a fuel pressure gauge. If there is pressure to the injection pump then the problem is injection pump or clogged or malfunctioning injector. If there is not pressure to the injection pump then could be weak fuel pump, or clogged something or other. Without a gauge you can loosen fittings and observe what happens when you turn the key on, run the starter etc.
Good luck. It is just a bunch of parts and pieces. Something will turn up.
PS the terror of not being able to diagnose my diesels fuel problems was solved many years ago when I decided I had to know what the fuel pressure was as certain points in the system. I bought a cheap gauge and worked out proper fittings on each engine and it is easy not to know when filter needs changing, or what is going on from cold to hot etc. Just changes the whole equation. I think fuel pressure should be a standard gauge on diesel engines. It takes the voo doo artistry out of the equation.
