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mix gas and oil at 50:1 --------Just feed the discharge of the pump to the intake line of the oil pump.----Just a bit of plumbing and easy to convert should you want to market / sell the motor.
My post makes no mention of removing the tank!
You are making this to be more difficult / involved than it is !!------Post #3 has the information that you should follow.-------Nothing more needs to be done at all.-----------Keep enuff oil in the tank so that alarm does not come in.