Help with tracing and testing wires for a in tank fuel pump PLEASE!

I have a 1990 Isuzu Trooper GLC. 2.8 engine. I have recently replaced the in tank fuel pump. Still not starting. I have checked the relays,
20amp fuse, direct power (12V) to the new pump in the tank and it does kick in. I only did that a very short time. I needed to know if the connections on top of the mounting bracket on the tank worked. I am at a loss as to how to trace and test the wires. If I turn the key on, it's my understanding that the pump is supposed to kick in for a couple of seconds then shut off. Mine makes no sound at all. Should there still be power at the pump wire if the key is left on and I use a test light. I know this is a lot of questions but I'm getting desperate and frustrated. Any help or advice would be appreciated.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.