After a good ride about 15 minutes, i was going to ride again my -88 iroc, it started well but after some seconds shut down and wont restart.

i checked if there goes electricity to fuel pump (exterior, changed from original) and showed zero volts.

What should i do next? is there a way to skip the relay to see if that is the problem?

 

spray brake cleaner through throttle body see if that starts it also with no power to the pump make sure the alarm isnt tripped if it has that and i would see if you can trace the wires to see if there is a kill switch relay for it