Hey KevDC,
The few times I had to have my fuel pump changed was when first I would press on the gas and the vehicle hesitates, til the point I got somewhere and it just cut off. I tried to crank it up, I can tell it was trying to turn over while i was pumping the accelerator, but it wouldnt crank. The second time was when my gas guage was sporadically moving back and forth to the point it just stayed on E, even when I knew it was full. Those were my signs.