Appears we have the problem resolved...This post is for someone in the future that may have this problem on a bd-154 or bd-144 engine(British designed engine).
Fuel pump arm was slipping off the crankshaft lobe to the rear of the tractor the crankshaft lobe was worn unevenly. Used 2 e-clips 1/4 inch size to shim the fuel arm to the "front " of the engine on the arm"s pivot shaft. The e-clips pushed the lever arm to the side so it tracks better on the lobe. You could see the lobe had worn unevenly(slightly) by looking through the fuel pump arm access hole. One could also elongate the fuel pump mounting hole on the pump so the pump could shift to compensate for the lobe wear tracking problem,or go buy an electric fuel pump and use a block off plate.
The symptoms is as noted before sudden loss of fuel pressure resulting in engine dying due to no fuel pressure output from the pump.
If you are reading this the problem is hard to diagnose and easy to fix.
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