My GM fuel pump went 275,000 miles. Low fuel in the tank adds to the failure as the fuel keeps the pump cool. I cut a hole in the floor of my K-5 Blazer and replaced the pump in two hours including
repairing the floor. In your case dropping the tank and having it cleaned sounds like a good idea. I know this, if your car/truck fuel pump fails, have someone crank the engine and someone bang the tank
with a rubber mallet or wood and the vehicle usually will start one more time, possibly two to get you home or to a safe place, just don't shut it off. This comes from a AAA guy that has done it many times.