[Palmtrees57chevy]

Once the fan comes on it stays on until the temp drops below 175. A little bit more info, I don't have a fuel return line, just the one line from the tank to the carb. After I had connected the electric fuel pump, and prior to reconnecting the mechanical pump, I had turned the key to see if the electric pump worked. It shot fuel out the line like you wouldn't believe. So the fuel goes through the line ok.

Hey just a quick thought, could the problem be from the tank not being vented properly? I have the vent line running from the top of the tank into the filler neck with a vented gas cap. The tank is a 20 gallon tank out of a 83-84 Ford Ranger.