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Have a 4020 and thought it ran out of diesel the other day. Bled all the lines and even used a little Starting Fluid, it would kick over with that but would not stay running. Another farmer and I was trying to get it fixed when we came across a standard screw on the return side of the injector. We took the screw out, and the dam thing started and ran perfect but leaked diesel like a siv. We thought this was some sort of blead screw, but as we began to screw the screw back in the motor began to loose power, throttle, then die. Need to get this tractor back on the clock, any help would be appreciated.