I don"t think you have air in the system if it starts and then dies. I think you have a problem in the return line. If the pump can"t return fuel to the tank, which it returns more at idle, it builds pressure up internally and quits pumping fuel. Remove the return line at the injection pump. Start it and see if it runs then. If it does then you have a blockage in the return line/system. Remove the fuel cap and blow air through the return line and you should hear a good steady flow. I had a 4020 drive me nuts this spring. It had restriction in the return system. I finally went fitting to fitting checking if I had flow. I found a piece of rubber stuck in the elbow at the tank, came out of the injection pump which was what I was replacing. Removed it and all was well.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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