[Marty_B]

Hi All,
I recently acquired an Irwin 28 with an Atomic 4 engine. The wiring for this engine has many cut wires and is a mess. I have since taken the engine out and have it on a stand. I noticed that it has an electric fuel pump, but it is not connected electrically. I also noticed that there is no oil pressure safety switch.
With that being said, I have two questions,
1) first, is it better to have the oil safety switch installed above the pressure adjustment screw or where the oil sending unit is?
2) I have heard that an electric fuel pump sometimes requires a return to tank line. My boat currently has no such line. I have read that the carb needs about 1 psi of pressure to run correctly. At what pressure would a return/bypass line be required?

Thanks for your help.