Well, I'm no expert but this sure sounds like the way my fuel pump was reacting before it finally died. It ran fine during the day -- multiple start/stop cycles, but then when I was ready to leave work at night -- no joy. I could crank the engine 'till the cows came home and no light-off. Next morning armed with my trusty VOM to pull codes the engine would light right off. After having to call my wife twice to come and get me, I got the Raider home and in the garage, where it finally failed permanently. After replacing the fuel pump I haven't had any more problems.

I suspect your fuel pump is dying a slow death.

That being said, if you suspect the voltage, there is a test terminal up under the passanger side dash that you can apply 12v directly to the fuel pump, bypassing the fuel pump relay. If you give it 12V and there's still no light-off the "No Start Tests" document points very strongly to the fuel pump being bad.

Eric W.