Back to the 235 HP Evinrudes
We never disconnected the OMC pumps, we just added a Holly between the tank and the fuel pumps. The Holly just "OVER RODE" the OMC pumps, and we ran low enough pressure that they basically worked like "Floatless" carbs. I know our 235's would die in the corner without a Holly pump!
Tim Soares actually plumbed the line around the pump, so if the pump quit the omc pumps could still suck the fuel around the pumps. OLD Enduro racers knew finishing was half of winning.
I just put in a call for Tim to see if he remembers what pressure we set the props!