Very possible that the regulator is the problem. Is there a electrical component at the base of the mixer assembly, (on top of the intake manifold)? It would have a 2 wire plug attached. If you have this it is a trim injector. You can remove it and clean it with carb cleaner. If you remove it and leave it connected and turn on the key switch it should pulse. If it does not pulse you need to replace it.
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