Fuel pressure? Seriously, this sounds a lot like a problem I had with a clogged pickup screen on the fuel pump in the tank (causing very low fuel pressure). Would start and run for a bit and then just die. Kept getting worse and worse.
Obviously you said you already took the pump out and looked, but you don't really know what kind of pressure it's putting out, you really need to get a fuel pressure gauge and test it.
Obviously you said you already took the pump out and looked, but you don't really know what kind of pressure it's putting out, you really need to get a fuel pressure gauge and test it.