1998 Ford Mustang Gt

Is the fuel pump running when you turn the key/ignition to the run position? If not, check your fuel cut-off (inertia) switch in the trunk to see if it popped. Check all your fuses, both under dash and in engine bay. Swap your fuel pump relay with a known good relay like A/C relay. They should all be the same. If fuel pump still doesn't run, it's probably bad. You can also turn the ignition to the run position and check for power to the pump. If getting power, pump is bad. If no power, PCM may be bad.

Hope this gives you something to try...

Check out this thread for starters:

http://www.stangnet.com/mustang-forums/threads/99-ford-mustang-gt-problems.876009/