We just had to replace a relay on our Workamaster 75. It was a relay (but a module with a fancy name)that all the safety switches reported to that then turned the fuel on in the injection pump. It was causing the tractor to not start from time to time and it did shut if off once or twice as well. I know the safety systems are probably pretty similar on your TC40A.
Can you locate the fuel shutoff solenoid on the pump and supply 12v to it. Effectively this would bypass all the safetys and allow you to see if the problem goes away.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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