I would highly suggest that you have 3/4 inch silicone supply to the inlet of a self prime pump. We use tri clamps when ever we can. You want full port 1/2 on the inlet side. Restrictions on the output are not a problem.
We did our own schematic prior to starting but had to make modifications. We have a 3 March pumps.
Also from now own, we will only purchase braided silicone hose. The non braided is too soft when hot.