THUMPING NOISE IN GAS TANK AND GAS GAUGE NOT WORKING

What is your question?

My 97 Buick was making a thumping sound in the tank and I had a small leak in the tank and the gas gauge quit within a couple of weeks. I replaced the leaky tank and the sending unit/gas pump and guess what. The gas gauge still does not work (stays at full like before) and the thumping is still there. Think the is related to the same problem? I thought the float was making the thumping and need adjustment. CADPLAN