You say it has a 6 volt electric pump in it. I didn't know there were ever any 6 volt fuel pumps made. Is it possible that it is a 12 volt pump? If so, it will probably work in a 6 volt system, but at less than half capacity.
I have to agree with others, though. I'd put a new mechanical pump on it, with a fuel filter between the fuel tank and the pump, and get rid of the electrical pump.
But than again, my father had a 1962 Jeep Wagoneer and the float bowl would not stay full if it was parked overnight. I never did find out why, but we added an electric pump to fill the bowl and shut it off when the engine started.
