I put five gallons of gas in it and it still would not crank?

The fuel level sensor went out. I replaced the fuel pump and ran great for a couple of days. Apparently, the new fuel level sensor was inaccurate causing me to run out of fuel. I put five gallons of gas in it, and it still would not crank. I had it towed to the dealership for them to tell me the fuel level sensor is bad and also a bad battery. Took the battery to the auto parts store since it was still under warranty. They charged it and confirmed the battery was good. Drove to the dealership where my truck was and told them I would replace the fuel pump and had a new battery since they wanted to charge me $1,600.00 for everything. They said that would be fine as long as I didn’t mind filling up every couple of days. I put the new battery in and an extra five gallons of gas. Truck still won’t crank. It’ll run for one second and then shut off like trying to crank a cold muscle car with a carburetor. Any advice? I don’t trust the dealership anymore.