I have a 93 240sx that keeps blowing a relay.

[knx2]

For some reason two weeks ago my car would not turn over. It will just crank and crank. So my friend and I decided it was the fuel pump, so we switched that out with one from autozone and then switched out the fuel filter. The car still did not crank until we switched out the relay and the car ran great for a week and now I have the same problem. So we decided to bypass the relay just to see if we could get it to pump fuel and it does. So what could be blowing the relay? What action should I take on fixing this problem? Any help is greatly appreciated.

[supra brit]

Check all your wiring. You prob have a short somewhere.