bypass original fuel pump or not

[whatwas]

I moved the fuel tank to the rear of the frame (spare tire area) of my 67 truck. Its the old aux. tank from my GMC 3500 so the electric fuel pump (frame mount) was intended to pump from tank to tank. My question is, do I route the fuel line through the electric fuel pump into the original engine pump or by-pass the engine pump and directly to the carb. My fear would be to overpressure the float in the carb.