WHY WOULD I HAVE ONLY 5 VOLTS AT THE FUEL PUMP CONNECTION

It all depends on which connector and pin you're looking at. If it's a pcm wire then it could easily be a 5 volt reference voltage. You would need to find a wiring diagram with pin diagram and follow it. Before you go too much farther with that, you maybe should look at taking it to a shop, depending on what you're trying to accomplish.