bmw 325 fuel-pump testing and replacing

I have a 1989 bmw 325 and it doesn't seem to be pumping fuel.
Where is the fuel pump?
Is it fused?
How do I test it?
Are the fuel lines under the hood about 1/2"+ in diameter with non-reusable clamps?

I found the fuel pump in the tank through an access panel under the back seat.

It was a relatively easy fix.
Suggest buying BMW fuel pumps from salvage dealer.

Under the seat is the fuel control panel switch.