diagram or schematic that shows where each wire goes through the firewall from engine into the backup the fuse box under dash needed?

Sure, here is a guide to help you check the power feed wires and the wiring diagrams to help you see how the system works and which wires to test.

https://www.2carpros.com/articles/how-to-check-wiring

I would test the ignition switch first. Check out the images (below). Please let us know what happens.

Hi,

I tested the ignition switch, and it seems to be working fine. I'm hoping I don't have to drop the gas tank. My fuel pump primes the lines up to the TBI but stops before it hits the injectors. I replaced injectors. The van runs with constant prime. But it won't start on its own as it's not getting the gas. After the pump primes and shuts off about 1 min to minute and a 1/2 later, I hear some kind of dripping like water dripping after u turn the shower off inside the tank. I'm baffled. It seems all problems are pointing to fuel pump. I'd be appreciative beyond if you can give me an idea of what to do. Also, is there a fuse connected to injector wires somewhere that could be blown? A friend said look for it and make sure the fuse is good. I haven't found it. One more thing, the pump runs too long to prime and when I turn the key off, I lose all pressure and when I turn the key back to on position the pump runs for minutes until it builds pressure again.

I have seen the fuel line inside the fuel tank fail which will cause the problem you are describing. Here is how to remove the tank so you can check out the pump. Check out the images (below). Please let us know what happens.

Thanks! Going to try that next.

Sweet! please let me know.

So pretty sure this was the problem..

Sending unit and pump/filter fell apart as I was pulling it out. Now that it's out, any ideas on how to clean the tank out? The van sat for years. It's pretty nasty in there.

Good find, yep cleaning the tank can be a challenge. I would use new gas and clean shop towels and mop up the mess while rolling the tank around to try and get as much out as possible. If it cannot be completed successfully a new tank is in order.

Cleaned the Tank out like you said. Worked like a charm. Obviously the fuel pump is trash as it disintegrated as I pulled it out of the tank, but the sending unit looks okay....any thoughts on keeping the sending unit and buy new pump?

I would send a new sending unit; they can go bad internally with rust and since you are there might as well. Let me know how it goes.