Re: fuel pump check?
I lowered my fuel tank once and as far as i remember you can just remove/install the skid plate without removing the tank.
Eventhough the fuel filter is not a scheduled maintenance service item, it is still a good idea to change it once. But you can do this at any time, the tank doesn't need to be lowered for that.
Fuel pump can survive the jeep, or it will break down at any moment, you will never know. There is nothing to measure besides the pressure.
Hoses normally will only be changed if you see dry cracks in them.