How to Diagnosis a spark Problem Ford f-250 (1991 -4.9l )?

Both tanks didn't work and had holes, Took off, Wire wheeled and brushed all rust, THen Painted with Thick Rust-Oleum Metal Primer. And then Thick Black Aluminum Siding Paint.

So i put new tank on.
charge battery
check fluids
Installed battery and tried to start

Turning over
prayed Starting fluid in were filter goes
Still nothing

Now if there's no spark, unless i sprayed in wrong place0_o, line of diagnosis is

1.Fuel tank Swich(inside truck Marked F-Front, R-Rear)
2.Relay
3.Pump

If its the spark
I don't even know where i should start

First, I must say, taking a wire wheel to a gas tank is, well, risky at best.
Second, I wonder if both of those paints you used are "gas proof"?
Next, you mentioned the auxilary tank switch on the dash. What about the diverter switch in the fuel line? Is it blocking BOTH tank lines?

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