gas tank only 13ish gallons???? missing 3-4 gallons

Any evidence of tank damage? The sender might be bent or otherwise up off the floor of the tank. That is, the suction tube

no tank damage it is near new as with pick up whole car was rebuilt around a year ago just before i bought it. Guess its possible pickup could be bent up off the bottom guess ill have to wait for it to get near empty again not that that take all that long.