The subject says it all.

When I turn the vehicle on, I cannot hear the fuel pump engage as it should.

I was working near the ECU the other night, and pushed two 4 awg wires through the speedo cable grommit. After I pushed the wire through, the engine will turn over, but won't start... When I turn the key 'on' I would previously hear the fuel pump running, now it is completely silent -- hence my suspicion of the inertia switch.

No inertia switch...you may have knocked a wire or connector loose.

When I rifled through the fuses the other day, I missed the one bad one.

It runs now, thanks.