Could be grounding, but that doesn't narrow it down much. The primary question is whether the problem is at the gauge or the sending unit (usually in the fuel tank itself). A bad component or bad wiring at either end can have that symptom. Usually the wiring in between is OK, but it is still conceivable there is a problem there as well.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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