You sure it's not just having trouble priming? That's common after a rebuild.
No, pulse will be the same no matter where you pick it up from.
If the pulse is that weak, then the motor is shot. I doubt weak pulse is the issue.
Edit: I suppose there could be an issue with the vent valve. I'm not too familiar with the Onans. I've worked on them, but not much. Most all small engines have a reed valve. It could be a problem with it. I'd try pouring gas down the carb to get it to run a bit and see if it starting picking up fuel.
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