Join Date: Mar 2014
Location: Indianapolis, IN
Re: fuel overflow 65 Galaxie
The only things I can think of is the fuel pump (too high a pressure, forcing past the needle and seat), gas cap or vent problem (pressure building in the tank, same result), or fuel percolation from the carb getting too hot. This is more of a problem with modern ethanol fuels which boil at a lower temperature.
If you have a vacuum gauge, see if it is also a fuel pressure gauge. Many are. If so, unhook the line to the carb and connect it to the gauge instead. You can start and run the car just on the fuel in the carb, and read the pressure on the gauge. Should be 4-5 PSI.
1964 Galaxie 500 2 dr Fastback, 390, 4 speed, Indianapolis Indiana