Bear with me. It is a 1978 boat , but has been repowered with a 5.7 Mercruiser motor. I think about a 2002 vintage. I don't have the serial number here with me. My brother just bought it. It was only supposed to need a fuel pump (electric). (where have we heard that before?) I checked the fuel pump bypassing the oil pressure cut off and it would try and start (the pump not the motor), but not run. Replaced the fuel pump still with the bypass hooked up ran the pump until it had gas coming out of the line going to the carb. Hooked the carb line up, choked it and it started and ran good. Idles good ect. Haven't had it out on the water yet, but that is another story. The issue is I hooked the oil pressure cut off switch back up and now the pump won't run. It is possible because of a low battery I am not generating enough pressure for the pump to run. The motor has good oil pressure.