I just recently got a 1957 7.5 hp Evinrude Fleetwin outboard motor. I don't have any fuel lines for it and am not sure how to connect the fuel lines to the motor? I see there is a spot for a some kind of 3 prong plug,but cant seem to locate that part? Is there a way to connect the fuel to the motor without that plug? Also I am missing a nob on the front of the motor. Its the one on the very bottom. Does anybody know what it is for? Choke or something?