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From what I've seen in the early CIS cars, they do not prime when the key is switched on, and only fire the pump when cranking. Occasionally when the ignition is switched on, we do hear the pump prime, but I suspect it's really due to an intermittent power glitch triggering the relay momentarily, as this occurs rarely.
For what it's worth, if you read the owner's manual for the early cars, it states that when starting the engine hot, the accelerator pedal should be fully depressed. Note that the later L-Jet cars state this isn't necessary. My friend's '79 RoW occasionally has trouble hot starting. I've told him to try holding the accelerator to the floor while cranking, and he has found it does start better when hot. Obviously, you need to be ready to quickly let off the accelerator once the engine catches!
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