Apparently previous owner had installed an automotive fuel pump as my marine replacement pump has an extra vent hole on the bottom of the pump (below the diaphram). I assume this is encase the diaphram fails the fuel can be routed to someplace other then the bilge area?<br /><br />Where should the line from this hole be routed? To the carb? What type of line (tubing) should be used? Metal? flex?<br /><br />Thanks for any help!