1988 gmc S-15 fuel injector

On a 1988 gmc S-15 pickup with a 2.5 engine, I’m getting good fuel pressure to the carb and power to the fuel injector, but it’s not injecting fuel into the carb.  Am I safe to assume that I’ve got a bad injector? What’s puzzling me is that when I apply 12 volts directly to the injector, I do hear a “clicking” action!