I may have a solution for you. I just finished mine and had two problems.
First- found a bad fuse on the panel (think it was a 20 amp). Noticed the buzzer for the key was not working. Replaced the fuse, buzzer worked and had power to the pump. Key on- power for a couple seconds till the relay kicked in. Turned the engine over and power was going to the pump.
Red wire with black tracer at three pronged connector at tank.
So, with power and the pump not working, I connected an external battery to the pump and low and behold, the pump worked. Next checked the ground on the three pronged connector. No ground !
I spliced a wire to the black ground wire from the car, grounded it to the chassis and we have a repair.
Hope this takes care of your issue also.