1991 Chevy Camaro fuel injection

What would keep the injectors from sequencing, fuel pump new, tank and lines were cleaned, new fuel filter, new fuel pressure regulater, new dist cap, and wires, new ignition module, new rotor, has spark, has fuel pressure- after all parts were installed car started right up and ran smoothly, got up to operating temp and maintained smooth running for about 30 min, then just quit, since then no fuel coming from injectors, plugs dry, can introduce propane and engine will fire right up, and of course quit momentairily. Is there a relay that powers the system? Both fuses for the left and right side injectors in fuse block also good. Thanx