1994 olds 88 wont start no fuel mabye

Ok i was putting an amp and speaker in the car and we were almost done with the wiring and when my brother sat in the passanger seat everything shut off and few sec's later came back on well i thought to crank the car so the battery wouldnt die but when it started about 3 to 6 sec's it would just die and its been the same way for 4 days start and die start and die the fuel pump will come on and on top of the motor you press the little button thing gas will spray out but some reason still wont? dont think the anti theft would do this cause it was disconnected before. Can anyone help??

So, test the fuel pressure, look for 37 psi minimum.