That could certainly be a plugged, pinched gas line....that the valve is moving simply enough to cut off gas from your front tank although not much more than enough to get gasoline from your again tank. It is definitely not the situation the question was about, but as it is https://40-ft-shipping-container34320.onesmablog.com/a-secret-weapon-for-40ft-tilt-bed-shipping-container-trailer-77295576