Forget looking at the ECU
Try this first.
Empty your tank of most of it's fuel (it is more convenient this way).
Remove it from the frame.
Now check the wires that you had to unclip from the female lugs on the base of the tank where the base plate is.
Regardless of how good they look re place with new connectors.
Now follow the leads along the loom until you come to the next connector again inspect and check for corrosion on the the wire connection pins inside.
If there is any loose wires here or bad corrosion you may need to dump the whole connector and replace with new.
Going back to the tank check the connecting lugs and make sure they are riveted tight into the base plate.
Re connect and I am confident that you may resolve your fuel pumps inactivity problem.
