2.8 EFI Help

89 chev 2.8 mpi died on hiway, change ECM has spark and fuel to rail, starts if primed but no fuel thru injectors, powered fuel pump at check piont can here flow and has pressure on rails at rated press,Pos on one side of injectors with key on and as soon as hooked up pos on both side and does not inject HELP, any ideas ???? crank sensor was replaced also (cracked)