1987 Chevy Truck no power to fuel pump

Hello. This truck had been running. All of the sudden it stopped. It will turn over. We don't hear the fuel pump clicking on. We dropped the tank and replaced the fuel pump. The pump still doesn't appear to be getting any power. The fuel filter is new.

Talking to the neighborhood auto parts store they have suggested replacing numerous parts :-) Could you by chance help us narrow down what might be the most likely causes?

Thank you so much!