that is definitely fuel starvation. the gauge acts up during fuel starvation because the gauge is not made to provide instant feedback. if it had instant feedback, the gauge would be dancing up and down like a light show during the entire drive as fuel sloshes all around. so its not made to react to sudden changes. it displays an average of what the fuel sensors are reading. if the fuel on the passenger side goes empty due to fuel slosh causing fuel starvation, the gauge will go to zero, but not right away since it is "dampened".
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