[George Miller]

When it starts misbehaving this way, twisting the choke rod to add fuel to the carb seems to have little effect. Pulling the choke rod out about two-thirds of the way (flooding it with gas) will cause it to sputter a little less and limp a little farther.
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If what you say here that pulling the choke helps, then it is gas not electrical. If it was electrical pulling the choke would have no effect.

Check and see if the gas line is in the carb or filter to far and blocking the flow of gas.