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diesel fuel problems - priming

Mike I had to prime the fuel pump after letting the thing run out of fuel. It went well and ran fine with no missfires or lack of power. However it stops (seems to run out of fuel) after about 15-20 minutes of runtime. I bleed and prime system again, as per manual instructions but problems returns after a short time. I have changed fuel filter and run tractor after doing so, but for same intervals of time. At times, will priming the fuel lift pump by hand (pumping the lever) I get no air or fuel coming out of the number 1 air plug on the filter, even after a couple hundred pumps (slow and quick). Does this mean the lift pump is not working, or could there be a leak somewhere else in the system? Sometimes I go out hours later and pump the lever, after opening the air plug, and it pumps air then fuel again. It always seems to have resistence, iven when not discharging anything. I even hit the started to reposition the cam on the crankshaft relative to the fuel lift pump. What am I doing wrong, or what should I be looking for? Thanks for your help.

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