I've been looking for days and I couldn't find an image of that pump on brunner either....thanks for replying.....wishing there was something on the pump to help......I'll research champion......thanks for the tips
To me, that bolt-on crankshaft bearing cap pegs it as a Champion - I think they are still using that exact same part, see this modern-day pump as a reference (the crankcase can handle 3 cylinders - also see location of oil fill boss and sight glass):