Try putting the valve in the mid position. I would expect that you would not be able to blow through it through any of the pipe connections. That would tell you where the 'OFF' position is. If there is no off position, the mid position must open the two inlets to each other so allowing the flow of fuel to equalize. I doubt that this would be desirable so I expect that there is an 'OFF' position midway between 'L' and'R'.
David
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