2004 Chevrolet Avalanche 1500 fuel gauge reads incorrectly then goes to empty

It is very common for the fuel level sensor in the fuel tank to read the fuel level incorrectly on Chevrolet/GMC Trucks (the float arm switch goes bad). The sensor must be replaced to correct the condition(around $73.00,including shipping charge). or just replace the complete fuel pump module assembly(around $225.00,shipping price included for an OEM>>AC DELCO Part #MU1657 on high mileage vehicles to keep from doing this job twice.either way,you will have to drop the fuel tank,not fun if you do it yourself! those prices are from RockAuto.com...if you get it at a local parts store,add around $100.00 to the $225.00 for the complete assembly! just the fuel level sensor price is maybe $10.00-$15.00 cheaper at RockAuto,for the AC Delco Fuel Level Sensor Part # SK1275!