Loosen the bolt on the top of the injector for cylinder #1, located on the left side front of the engine, under the fuel tank. Prime the system with the manual pump located on the right side of the tractor to the rear of the fuel filter and above the starter. Prime until clear fuel without air spills from the injector. Repeat for injectors 2 and 3. If you have someone to crank the engine, you can close and open each injector repeatedly. Close the injector, build pressure, then release. It takes a while, stay with it.
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