This one goes back a few years, but I remember experiencing this problem. 6V92s have an electric solonoid shutdown valve connected to the fuel line on top of the engine operated from a toggle switch on the dash. Check the electrical connections. Don't forget the ground side of the circuit. In fact, if you cannot find a cause, try increasing the size of the ground wire to the solonoid. More than once,I have seen a larger ground wire cure this problem.
Karl
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