I have a 1994 Z28,,I am having fuel pump issues. The fuel pump will just quit working.It might be a day or a week or several times in 15 min. I have replaced the pump 2 times,Changed the relay under the driver side kick panel,Rewired from pump to behind the seat at junction.Im lost and need help! Also is there a way to eliminate the pump in the tank and go to a external pump?

 

One thing I didn't see that you replaced is the fuel filter, which you should do with a pump change.
If the filter is clogged and restricting fuel flow, it can make the pump work too hard, and wear the motor out.