Fordfarmer has a point, more likely that the problem is related to the fuel lines/filters/lift pump than the injection pump, especially as you have tried another (3) injection pump. My first guess would be a lift pump on it"s way out, diafram with a hole in it maybe, otherwise either a clogged filter or a bad pipe sucking air. You should get a good stream of diesel out of the bleed screws once the machine is bled, if it just dribbles out then the problem is related to the fuel supply to the pump, change the filters and check the filter in the tank (if you"ve had the tractor from new it should be there, if you bought a used tractor someone may have taken it off, and so a pipe might be full of crud, maybe blow the lines back from the lift pump to check they are clear).
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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