How about I move this over to the Force motor forum, although electrical has been disconnected, it's really more of an outboard problem then electrical
If you don't get some helpful advice in the next couple days (it is a long holiday weekend) and you think it'd be better served here, I can move it back for you.
I suspect the previous owner preferred to pre-mix gas to be sure the right amount of oil was mixed in, OR there was a problem and swapping to pre-mix solved it. Best of my knowledge, I've never seen someone ask to re-setup the oil mix pump once it's been disconnected. Lots ask about how to disconnect it though.