You have a loose connection somewhere. You're saying that the fuel pump worked for a while and then it didn't, and a different fuel pump didn't work either. That means it isn't getting power all the time, which could either be a problem with the power from the battery to the fuel pump, or a problem with the relay coil signal from the ECU. While testing, it likely that you moved something around enough to make a connection for a while.

At the moment, if the car won't start, you're in a perfect position to find what's going one. The hardest part of trying to track down an intermittent failure is getting it to fail so you can find the fault. Right now, it's still failed so you should be able to track down the problem. Bring in a fresh pair of eyes if you have to so you aren't missing something obvious; the worst person to find a problem is usually the person most familiar with the problem.

How were you checking everything? Were you using a multimeter, or were you using one of those useless trouble light probes that plugs into the cig lighter (I think someone on here calls those a "noid light" or something like that)?