Internal electric fuel pumps use the fuel for cooling.
I expect the Land Rover internal electric submersible fuel pump design has similar characteristics to GM and other vehicles. My understanding is that the fuel in the tank acts as a heat sink for the electric fuel pump motor.
As such, I routinely try to not run less than half a tank. In the past twenty years and perhaps half million miles, I have only had to replace one internal electric fuel pump.
Maybe I am lucky or maybe all the electric fuel pumps were the good ones, but I think that the availably of the fuel for cooling matters, and the more the better.
I also discovered the cost of filling the top half is the same as the bottom half.
While on the subject of fuel pumps, there is an internal screen filter within the electric fuel pump but no other replaceable filter between the gas tank and the engine.
The diesel engine 3's have external replaceable filters, but not the gasoline powered vehicles. And yes, there are two internal fuel level sensors, one at the front of the tank and the other at the rear with the fuel pump.