I have had an engine driven fuel pump fail twice. Once on a Curtis Wright 1820 Radial and the other time on a Lycoming O 320. Both times the engine picked up as soon as I turned the electric pump on. In the case of the Lycoming no operative electric pump would have resulted in a crash landing in inhospitable terrain, because of the pump I made an uneventful diversion to the nearest airport.
Flight with an inoperable fuel pump is both illegal as the aircraft certificate of airworthiness would not be in effect and IMHO, stupid as the electric fuel pump is the redundancy for a single point of failure.
Would you fly the airplane if only one magneto was working ?