Andrew: I was refering to the fuel pump/injector pump as one and the same(the pump with the injector line coming out of it). After I typed that the thought ocured to me that I might confuse you but I did not take time to make the correction. Do you have a parts book? The parts book should show a manual priming pump located between the sediment bowl and primary fuel filter to assist in bleeding the filters and after fuel flowed the priming pump added no futher pressure as the fuel pump/injector pump supplied the pressure. As the priming pumps failed they were discarded and not replaced. The P.O. of your tractor must/could have had starting problems and decided to replace the manual priming pump with an electric pump. As was noted no priming pump is needed as graivity works. NOW one more thing to check. Have you check the oil cup in the bottom of the air cleaner? Where are you located and is the temperature at or below freezing? It is possiable that over time the oil cup at the bottom of the air cleaner will fill with water and when frozen block air flow to the engine. It is also possible for the filter element above oil cup to become blocked with dirt which will block the air moving to the engine. Without air an engine will not run. I do not recall you or anybody talking about the air cleaner so I am putting this thought out for you to consider. I have been around 560's and other tractors and trucks for 50+ years and sometimes the simple (and cheap fixes) will be the hardest to find. Hope this information will help. Thankyou for your reply and please continue to update. Armand
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