2006 VOLVO SW, FUEL GUAGE NOT WORKING PROPERLY, WHEN FILLED UP ONLY SHOWS 3/4.

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ABOUT A MONTH AGO, I NOTICED WHEN FILLING UP MY TANK, IT WOULD READ ONLY ABOUT 3/4 FULL. 2 WEEKS AGO WHILE GOING ON AN APPT. IT RAN OUT OF GAS, GUAGE STILL SHOWED 1/4 TANK.IT THOUGHT SOMETHING MECHANICALLY BAD HAD HAPPENED.TOWED CAR TO REPAIR PLACE,THEY LOOKED IT OVER,DETERMINED,GAS GAUGE FLOATS BAD.TANK NEEDS DRAINED,REMOVED,GAUGES REPLACE, COST $400.00!NOW I FILL UP EACH TIME IT GOES BETWEEN 1/3 AND 1/2, HELP!!!! TOM L.