Not a clue why Morgan decided to use such an over rate pump, maybe it was cheap and there was a job lot available at the time of the design? The Land Rover Discovery V8EFi mainly sold to the land of the cheaper fuel (USA) and they soon discovered that the original spec pump (Delphi?) didn't last long and that the Walbro GS 342 was a good, local and (almost) direct replacement. I thought I would just use their experience and copy them, hence the choice. On the plus side of things the fuel must get filtered lots of times before getting used.