We have tried everything we can think of (including wholesale replacement of parts) and cannot solve the following. Car starts and runs great for a few minutes or about a half mile and then suddenly stops running. It appears to run out of gas but am not sure about that. We have replaced distributor, caps, wires, pump and pushrod. carb. harnesses, resistor, switch, and start relay. You can choke and restart car but it will quit again. You cannot catch it by pumping the gas. We have checked float level and installed carb spacer. None of this has changed or solved the problem. We have an inline electric pump used for start up. I need help.