^^I was going to suggest that, but I would suspect that after having tried to start it several times I would think that it 'should' be primed by now and electric pumps are not exactly known for loosing their prime. Additionally, the very design of our pumps is set up to scavenge every drop of fuel possible.
Still, though, it probably would not be a bad idea to to listen and see if you hear the pump trying to run. Turn the key to the start position, but dont actually try to start it. You should hear the pump run a second or two.
Its possible that if your pump was weak to begin with or border line then running it that low on fuel could have perhaps caused it to run hotter than normal and that would have pulled more current and that in turn may have popped a fuse. So be sure to check that. Then make sure that the Fuel pump relay is working. The easiest way would be to just swap it with one of the other relays in the under hood fuse box.
Though my initial suspicion would be that you popped a fuse since it was running beforehand. Ive had my GP going on 4 years now and I hardly EVER fill up before the warning light comes on and on many occasions I have drained it so well that I was able to put 18 gallons in the thing.
So while the fuel does cool the pump, and it could be possible that if you ran it long enough like that you could do some damage to it, if it were going to happen that quickly Id be replacing pumps about every other month. So check your fuse and such and make sure its not something simple.
Does the GP have some type of fuel pump reset switch. I know in my last vehicle they had one that was something like a manually resettable circuit breaker. Does the GP have anything like that?